kinetic enegy and work engery theorem questions with solutions

Showing 1–10 of 74 questions

• ParagraphmediumWork , Power and Energykinetic enegy and work engery theorem

  A block of mass m is kept in an elevator which starts moving downward from rest with acceleration a₀. The block is observed by observer A inside the elevator and observer B on the ground for a time interval t₀. Continue with the same arrangement.

  

  Sub-question 1

  According to observer A inside the accelerating elevator:

  Options

  • Option A

    Work done by gravity is zero

  • Option B

    Work done by normal reaction is zero

  • Option C

    Work done by pseudo force is zero

  • Option D

    All of the above

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• NumericmediumWork , Power and Energykinetic enegy and work engery theorem

  Consider an elliptically shaped rail PQ in the vertical plane with OP = 3 m and OQ = 4m. A block of mass 1 kg is pulled along the rail from P to Q with a force of 18 N, which is always parallel to line PQ (see the figure given). Assuming no frictional losses, the kinetic energy of the block when it reaches Q is (n × 10) Joules. The value of n is (Take acceleration due to gravity = 10 ms–2)

  

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  JEE Advanced 2014

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• MCQeasyWork , Power and Energykinetic enegy and work engery theorem

  Four particles A, B, C, D of mass m/2, m, 2m, 4m, have same momentum, respectively. The particle with maximum kinetic energy is :

  Options

  • Option A

    D

  • Option B

    C

  • Option C

    A

  • Option D

    B

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  JEE Mains 2024 06 Apr Morning Shift

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• MCQmediumWork , Power and Energykinetic enegy and work engery theorem

  Given below are two statements: Statement I: A truck and a car moving with the same kinetic energy are brought to rest by equal retarding forces. Both stop in equal distances. Statement II: A car moving east takes a turn and then moves north with unchanged speed. Its acceleration is zero. Choose the correct answer.

  Options

  • Option A

    Statement I is correct but Statement II is incorrect

  • Option B

    Statement I is incorrect but Statement II is correct

  • Option C

    Both statements are incorrect

  • Option D

    Both statements are correct

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  JEE Mains12 April 2023Shift 1Morning Shift

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• NumericmediumWork , Power and Energykinetic enegy and work engery theorem

  A spring gun of spring constant 100 N/m contains a 100 g ball. The spring is compressed by 0.05 m. The ball leaves the gun horizontally from height 2 m. Find the horizontal distance d (m) at which a box should be placed. (g=10 m/s²)

  

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  JEE Mains 2021

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• MCQmediumWork , Power and Energykinetic enegy and work engery theorem

  In the arrangement shown in the figure, masses 6 kg and 2 kg are connected by a light inextensible string passing over a massless pulley. The 6 kg mass is released from rest when it is 6 m above the ground. Taking g = 10 m·s⁻², what is its speed just before it strikes the ground?

  

  Options

  • Option A

    7.74 m·s⁻¹

  • Option B

    7.20 m·s⁻¹

  • Option C

    6.55 m·s⁻¹

  • Option D

    4.50 m·s⁻¹

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  JEE Mains 2026 6 April Evening Shift

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• MCQeasyWork , Power and Energykinetic enegy and work engery theorem

  A stone is projected at angle 30° to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be:

  Options

  • Option A

    1 : 2

  • Option B

    1 : 4

  • Option C

    4 : 1

  • Option D

    4 : 3

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  JEE Mains29 January 2023Shift 1Morning Shift

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• Multi-correctmediumWork , Power and Energykinetic enegy and work engery theorem

  Select the correct alternatives :-

  Select all that apply

  • Option A

    Work energy theorem can be applied in non-inertial frame of reference also.

  • Option B

    Work done by any force can be positive, negative or zero depends on choice of reference frame.

  • Option C

    Kinetic friction force always acts opposite to direction of velocity.

  • Option D

    Work done by a force is independent of the choice of reference frame.

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• MCQeasyWork , Power and Energykinetic enegy and work engery theorem

  A man who is running has half the kinetic energy of the boy of half his mass. The man speeds up by 1 m/s and then has the same kinetic energy as the boy. The original speed of the man was

  Options

  • Option A

    √2 m/s

  • Option B

    (√2-1) m/s

  • Option C

    2 m/s

  • Option D

    (√2+1) m/s

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• NumericmediumWork , Power and Energykinetic enegy and work engery theorem

  A 200 g block is released from rest from the top of the rough track shown, from a vertical height of 2 m, and finally comes to rest on the horizontal part. Find the negative of work done by friction in joules.

  

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