question_answer

           A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given a initial velocity of 4  by applying a force. The trolley comes to rest after travelling a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?

Answer:

  Given, and From the equation of motion, (a)    Total mass = 35 + 5 = 40 kg Work is done on the trolley W = Fs = ma (b)Mass of girl, Work done by the girl, S = Fs = mas