Answer: g, directed downward.
- A 2g downward
- B Zero
- C g, directed upward
- D g, directed downward
Correct answer: D. g, directed downward
Explanation: At the top the velocity is momentarily zero, but gravity still acts, so the acceleration is g directed downward throughout the flight.
On a velocity-time graph for uniform acceleration, the slope of the line gives the acceleration and the shaded area under the line gives the displacement.
Concept context
Equations of motion, projectile motion, relative velocity. Foundation of all mechanics.