First slide

Work done by Diff type of forces

Question

A car of mass m is driven with acceleration a along a straight level road against a constant external resistivity force R. When the velocity of car is v, the rate at which the engine of the car is doing work will be

Moderate

A

R v
B

m a v
C

(R+mo) v
D

(mo-R)v

Solution

$W = F \times v = (R + ma) v$

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