Question

A 15 kg ball is thrown straight upward with a speed of 20 m/s. What is the maximum height the ball reaches?

As energy is conserved, the potential energy at the ball's highest point is equal to the kinetic energy when it is thrown.

A. 14.0 m
B. 19.8 m
C. 20.4 m
D. 40.8 m

Answer 1

The maximum height reached by the ball is 20.4 m.

Step-by-step explanation:

We have,

Mass of a ball is 15 kg

It is thrown straight upward with a speed of 20 m/s.

It is required to find the maximum height reached by the ball. Let the maximum height is h. As energy is conserved, the potential energy at the ball's highest point is equal to the kinetic energy when it is thrown. So,

`mgh=(1)/(2)mv^2\\\\h=(v^2)/(2g)\\\\h=((20)^2)/(2* 9.8)\\\\h=20.4\ m`

So, the maximum height reached by the ball is 20.4 m.