Physics

Problem

At point

A

, a

0.4\,\text{kg}

ball is

3.0\,\text{m}

above the ground and moving upward with speed

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

. It later passes point

B

, which is

8.0\,\text{m}

above the ground, while moving downward. Neglect air resistance. What is the speed of the ball at point

B

? (Take

g = 9.8\,\text{m s}^{-2}

) a)

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

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

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

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