Question

A ball rolls off a table of height h at horizontal speed v. The ball moves as a projectile until it hits the floor. Assume that air resistance is negligible.

A) Which quantity remains constant while the ball is executing its projectile motion? (more than one answer may be correct)

1. its horizontal speed

2. its vertical speed

3. its vertical acceleration

B) What is the magnitude of the velocity of the ball just as it reaches the floor (assuming the floor to be uniformly horizontal)?

1. v

2. v+g

3. (2gh)^1/2

4. (v^2 + 2gh)^1/2

5. v- 2gh

Answer 1

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