Physics

Problem

5.0\,\text{kg}

cart moves at

4.0\,\text{m/s}

on a horizontal track before entering an

8.0\,\text{m}

region where a constant

3.0\,\text{N}

friction force opposes the motion. What is the cart’s speed after it has traveled the

8.0\,\text{m}

? a)

3.2\,\text{m/s}

5.0\,\text{m/s}

2.5\,\text{m/s}

1.4\,\text{m/s}