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Is there any net work done by external f...

Is there any net work done by external forces on a car moving with a constant speed along a straight road ?

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No.
If a car is moving at a constant speed, then net external force will be zero.
Because `a=(v-u)/(t)`
For constant speed v = u, then a = 0. (a - acceleration)
F = ma `therefore` F = zero. i.e. no. external force.
W = F.S. = 0. So net work done is zero.
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