A trolley of mass 360 kg lying on a horizontal friction less surface. A man of mass 40 kg runs with uniform speed on the trolley a distance of 2 m in $0.5 \;s$. What is the velocity of the trolley relative to the earth?

Question

\[\begin {array} {1 1} (a)\;0.8\;m/s & \quad (b)\;0.4\;m/s \\ (c)\;1.6\;m/s & \quad  (d)\;2.2\; m/s \end {array}\]