A body is projected horizontally from the top of a cliff with a velocity of 9.8m/s. What time elapses before horizontal and vertical velocities become equal?(Take g = 9.8m/s)
Correct answer: D. 1s
- A. 9.8s
- B. 0s
- C. 10s
- D. 1s
Explanation
Horizontal velocity vx is constant = 9.8 m/s. Vertical velocity grows as vy = g t = 9.8t. Setting vx = vy gives 9.8 = 9.8 t ⇒ t = 1s.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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