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**1. The problem statement, all variables and given/known data**

A ball is thrown vertically downward strikes a surface with a speed of 15m/s. It then bounces, and reaches a maximum height of 5 meters. Neglect air resistance on the ball.

a) What is the speed of the ball immediately after it rebounds from the surface?

b)What fraction of the ball's initial kinetic energy is apparently lost during the bounce?

c)If the specific heat of the ball is 1,800 j/kg*C, and if all of the lost energy is absorbed by the molecules of the ball, by how much does the temperature of the ball increase?

**2. Relevant equations**

KE=1/2mv^2

Q=mL(delta "T")

**3. The attempt at a solution**

my answer for a was crazy so i am pretty much stuck with the rest