Question

A man weighing 80 kg is standing on a trolley weigh­ing 320 kg. The trolly is resting on frictionless horizontal rails. If the man starts walking on the trolley along the rails at a speed 1 ms^-1 then after 4 second his displacement relative to the ground will be

• A. 3.0 m
• B. 3.2m
• C. 4.8 m
• D. 5m

Answer 1

Answer: (B)

3.2m

Answer 2

80(4) = 400(x) or x = z $\frac { 4 } { 5 }$ m

Displacement = 4 - $\frac { 4 } { 5 }$ = 3.2 m