A projectile is thrown horizontally from a 490m high cliff with a velocity of 100 ms-1. The time taken by projectile to reach the ground is:
Correct answer: D. 10 s
- A. 2.5 s
- B. 5.0 s
- C. 7.5 s
- D. 10 s
Explanation
Vertical fall time from height h: h = 1/2 g t² ⇒ t² = 2h/g = 2×490/9.8 = 100 ⇒ t = 10 s. Horizontal speed does not affect during fall time.
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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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