A rock is thrown straight up with a velocity of 9.81 m/s.Its acceleration at the top of the flight is A)0. B)-9.81 m/s². C)+9.81 m/s². D)19.62 m/s².

Question

Quizplus · Accepted Answer

At the top of its flight, the velocity of the rock is 0. Since acceleration is the rate of change of velocity, the acceleration at the top of the flight would also be 0. Option A and D can be eliminated because they imply a non-zero acceleration. Option C is incorrect because it indicates a positive acceleration, whereas the velocity is decreasing at the top of the flight.

A Rock Is Thrown Straight Up with a Velocity of 9.81