Chapter 4, Problem 69A

To determine

To identify:The forces and agents acting on the tossed ball straight up in air at three points on the way up, at the very top and on the way down.

Explanation of Solution

Introduction:

As the ball is moving up the gravitational force acting on the ball is same at three points.

The free body diagram is:

  

To determine

Theacceleration of the ball at top of motion.

Explanation of Solution

Introduction:

As the ball is moving up the gravitational force acting on the ball. Due to this, the gravitational force velocity of the ball decreases continuously. When ball reaches at the top,the time velocity of the ball becomes zero.

Explanation:  But the acceleration acting on ball due to earth is same at every point. So, the acceleration of a ball is $a=9.8\text{ m/s²}.$