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

The maximum height reached by the ball is 20.4 m.

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,

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

d. air pressure decreases as altitude increases.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form