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

G1 Physics · Accepted Answer

For horizontal projection, initial vertical velocity is zero. Using h = ½gt²: 490 = ½(9.8)t², so t² = 100 and t = 10 s.