find the weight of a girl whose mass is 5 kgs?? its urgent pls
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320 J
mass of girl m=35kg
mass of trolley=5kg
total mass=40kg
initial velocity of trolley u=4ms
−1
final velocity of trolley v=0ms
−1
distance s=16m
we know,
v
2
−u
2
=2as
a=
2s
v
2
−u
2
=−
2×16
16
a=−
2
1
ms
−2
Force=ma=40×(−0.5)
=-20N
work is done on the trolley=20N×16m=320 J.
work was done by the girl =0 J.
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