First slide

Collisions

Question

A tennis ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. What fraction of its energy is lost in the impact

Easy

A

$\frac{1}{4}$
B

$\frac{1}{2}$
C

$\frac{1}{3}$
D

$\frac{1}{8}$

Solution

Fractional loss $= \frac{ΔU}{U} = \frac{mg (h - h^{'})}{mgh} = \frac{2 - 1 .5}{2} = \frac{1}{4}$

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