A projectile is fired horizontally with a velocity of 98 m/s from the top of a hill 490 m high. Find the time taken to reach the ground. (take g = 9.8 m/s²)
Physics · Kinematics part-2 Projectile Motion · Projectile from height
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Question

A projectile is fired horizontally with a velocity of 98 m/s from the top of a hill 490 m high. Find the time taken to reach the ground. (take g = 9.8 m/s²)

G1 Physics · Accepted Answer

The projectile is fired horizontally, so initial vertical velocity is zero. For a vertical drop of 490 m, 490 = ½(9.8)t². Thus t² = 100 and t = 10 s.