Physics

Problem

A horizontal force of

12\,\text{N}

produces an acceleration of

3\,\text{m\,s}^{-2}

in trolley A on a friction-free track. The same force then acts on trolley B for

4\,\text{s}

, increasing its velocity uniformly from

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

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

. The mass of trolley B is a)

14\,\text{kg}

16\,\text{kg}

9\,\text{kg}

4\,\text{kg}