kinetic energy and work energy theorem questions with solutions

Showing 1–10 of 30 questions

• MCQmediumWork , Power and Energykinetic energy and work energy theorem

  An object moves horizontally with initial kinetic energy 10 J and displacement 3î m under force F = (-2î + 3ĵ) N. Its final kinetic energy is:

  Options

  • Option A

    10 J

  • Option B

    16 J

  • Option C

    4 J

  • Option D

    6 J

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• MCQmediumWork , Power and Energykinetic energy and work energy theorem

  A particle is projected at 45° to the horizontal with initial kinetic energy K. What is its kinetic energy at the highest point?

  Options

  • Option A

    K/√2

  • Option B

    K/2

  • Option C

    2K

  • Option D

    K

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  AIPMT 2001AIPMT 1997NEET

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• Multi-correctmediumWork , Power and Energykinetic energy and work energy theorem

  Which statements about the work-energy theorem are correct?

  Select all that apply

  • Option A

    $W_net$ = ΔK remains valid when the net force varies with position

  • Option B

    If net work between two instants is zero, final speed equals initial speed

  • Option C

    Zero net work implies acceleration was zero throughout

  • Option D

    Individual forces may do non-zero work even when net work is zero

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• MCQmediumWork , Power and Energykinetic energy and work energy theorem

  A mass M travels around a horizontal circle at uniform speed v. What happens to momentum and kinetic energy when it reaches a diametrically opposite point?

  Options

  • Option A

    Kinetic energy changes by Mv²/4.

  • Option B

    Momentum does not change.

  • Option C

    Momentum changes in magnitude by 2Mv.

  • Option D

    Kinetic energy changes by Mv².

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  AIPMT 1992NEET

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• MCQmediumWork , Power and Energykinetic energy and work energy theorem

  A particle of mass 5m at rest explodes into three fragments. Two fragments of mass m each travel along mutually perpendicular directions with equal speed v. The energy released is:

  Options

  • Option A

    3mv²/5

  • Option B

    5mv²/3

  • Option C

    3mv²/2

  • Option D

    4mv²/3

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  NEET 2019

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• MCQmediumWork , Power and Energykinetic energy and work energy theorem

  Masses 1 g and 9 g move with equal kinetic energies. Find ratio of magnitudes of their linear momenta.

  Options

  • Option A

    1 : 9

  • Option B

    9 : 1

  • Option C

    1 : 3

  • Option D

    3 : 1

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  AIPMT 1993NEET

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• NumericmediumWork , Power and Energykinetic energy and work energy theorem

  A 2 kg body is projected vertically upward with speed 20 m/s. During upward motion a constant resistive force of 4 N acts downward. Take g = 10 m/s². If maximum height is N/3 m, find N.

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• MCQmediumWork , Power and Energykinetic energy and work energy theorem

  A 1 kg block moving at 6 m/s on a smooth horizontal surface compresses an ideal spring of force constant 200 N/m. Maximum compression is:

  Options

  • Option A

    0.30 m

  • Option B

    3/√50 m

  • Option C

    0.50 m

  • Option D

    3/5 m

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• MCQmediumWork , Power and Energykinetic energy and work energy theorem

  A bomb of mass 30 kg initially at rest explodes into pieces 18 kg and 12 kg. The 18 kg piece moves at 6 m s⁻¹. Find kinetic energy of the 12 kg piece.

  Options

  • Option A

    324 J

  • Option B

    486 J

  • Option C

    256 J

  • Option D

    524 J

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  AIPMT 2005NEET

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• NumericmediumWork , Power and Energykinetic energy and work energy theorem

  A 2 kg particle starts from rest at x = 0 and moves along the x-axis under F(x) = 6x + 4 N. If its kinetic energy at x = 3 m is N joule, find N.

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