First slide
Relative motion based problems

A man weighing 80 kg is standing on a trolley weighing 320 kg.  The trolley is resting on frictionless horizontal rails.  If the man starts walking on the trolley along the rails at speed 1 m/s, then after 4s his displacement relative to the ground will be :


Man travels in 4sec, 4 x 1 = 4 m
Trolley moves back word = 4×8080+320=320400=0.8m
Net displacement w.r.t ground. 4 – 0.8 = 3.2 m

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