Physics

Problem

A spring-powered toy launcher uses a spring of constant

k=400\,\text{N}/\text{m}

compressed by

0.10\,\text{m}

to project a

50\,\text{g}

ball. If

30\%

of the stored elastic energy is lost to non-useful effects, find the speed with which the ball leaves the launcher. a)

8.9\,\text{m/s}

10.6\,\text{m/s}

7.5\,\text{m/s}

4.9\,\text{m/s}