Physics

Problem

0.50\,\text{kg}

ball is thrown forward at

6.0\,\text{m}\,\text{s}^{-1}

relative to the ground. A friend on a skateboard moves in the same direction at

4.0\,\text{m}\,\text{s}^{-1}

relative to the ground. What kinetic energy does the friend assign to the ball? a)

2\;\text{J}

1\;\text{J}

9\;\text{J}

0.50\;\text{J}