A man weighing $80\, kg$ is standing in a trolley weighing $320 \,kg$. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of $1 \,m / s$, then after $4\, sec$ his displacement relative to the ground will be ........ $m$
A man weighing $80\, kg$ is standing in a trolley weighing $320 \,kg$. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of $1 \,m / s$, then after $4\, sec$ his displacement relative to the ground will be ........ $m$
- A
$5$
- B
$4.8$
- C
$3.2$
- D
$3.0$
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