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CBSE Class 9 Answered

A child of mass 35 kg is sitting on a trolley of mass 5 kg. The trolley is given a push by applying a force such that it begins to move with a speed of 4 m/s. The trolley comes to rest after covering a distance of 16 m. Find (i) the work done on the trolley (ii) the work done by the trolley before coming to rest.
Asked by Topperlearning User | 18 Mar, 2015, 03:10: PM
answered-by-expert Expert Answer

 

 

Work done on the trolley (i.e. to make it gain speed of 4 m/s) = 320J (force applied is in the direction of displacement)

Work done by the trolley (to come to rest) = -320 J (force acts opposite to the direction of displacement)

Answered by | 18 Mar, 2015, 05:10: PM

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