Physics

Problem

A machine pulls a crate on a horizontal floor with a constant force. The speed of the crate increases uniformly from

2\,\text{m/s}

6\,\text{m/s}

20\,\text{s}

while

6000\,\text{J}

of work is done. What is the magnitude of the pulling force? a)

150\,\text{N}

300\,\text{N}

75\,\text{N}

50\,\text{N}