Physics

Problem

A trolley of mass

500\,\text{kg}

starts from rest on a frictionless track. Its motor provides a constant power of

20\,\text{kW}

. What is its speed after

10\,\text{s}

? a)

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

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

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

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