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6) W=F.S
= 10 × 0.3
= 3N
5) let us assume that time taken by the car is 1 s
a=v-u,/t
=20 - 15/1
= 5m/s*2
F=ma
=1500.5
=7500N
S=ut+1/2at*2
= 15 + 5/2
= 17.5m
W=F×S
=7500×17.5
=131250J
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