A rock is thrown straight upward from the edge of a 30 m cliff, rising 10 m then falling all the way down to the base of the cliff. Find the rock's displacement.
Correct answer: B. 30 meters downward
- A. 20 meters downward
- B. 30 meters downward
- C. 40 meters upward
- D. 50 meters upward
- E. 60 meters upward
Explanation
The displacement is the distance of the rock from the initial position, the initial position of the rock was at the cliff which was 30m. So the displacement of the rock is 30m downwards, although the distance traveled is 50m in total.
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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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