# A child of mass 35kg is sitting on a trolley of mass 5kg.the trolley is given a push by applyinga force so that it begins to move with a speed of 4 m/s.the trollye comes to rest after covering a distance of 16m find 1) work done on the trolley 2) work done by the trolley before coming to rest

2
by jaya1603

2015-02-06T09:40:09+05:30

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Total mass of system=35+5=40kg
initial velocity(u)=4m/s
distance covered(s)=16m
final velocity(v)=0m/s
work done by trolley=v²-u²=2as
16=2a×16
a=1/2
f=m×a
f=40×1/2
=20N
w=f×s=20×16
=320J
2015-02-08T14:03:00+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Work done by trolley=v²-u²=2as
16=2a×16
a=1/2
f=m×a
f=40×1/2
=20N
w=f×s=20×16
=320J