Answer to Question #141501 in Mechanics | Relativity for Oler

Question

A ball is thrown vertically upwards. The quantity which stays constant is (a) displacement (b) speed (c) kinetic energy (d) acceleration (e) velocity. Explain reasons for your choice

Answer 1

After the ball is thrown, only the force of gravity acts on the ball, so it moves with a constant acceleration, which is equal to the acceleration of gravity. The flight speed of the ball first decreases until it becomes zero. The ball then begins to fall downward at an increasing speed. The kinetic energy of the ball changes similarly to the speed. Thus, only the acceleration remains constant.

Answer: (d) acceleration