Practice question · Select all that apply
A stone is thrown straight upward. Select every statement that is TRUE about its flight, ignoring air resistance.
Hints
- Gravity acts the same way for the whole flight, whichever way the stone happens to be moving.
- Two options assume the acceleration follows the velocity.
Show the answer
- B. Its speed decreases on the way up and increases on the way down
- D. Its acceleration is downward throughout the flight
- E. Its velocity is zero at the highest point
Why
Gravity pulls downward at a constant g for the entire flight, so the acceleration never vanishes or reverses. Only the velocity changes sign, passing through zero at the top, which is precisely why zero velocity cannot imply zero acceleration.
Practise Kinematics: Describing Motion
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