First slide

Power

Question

A car of mass 800 kg is being driven with a constant acceleration 1.5 m/s2 on a straight road against a constant resistive force 72 N. When the speed of the car is 72 km/hr, the rate at which engine is doing work will be :

Easy

A

25440 watt
B

28920 watt
C

27590 watt
D

26325 watt

Solution

Rate of doing work = Power
$= Fv = [72 + 800 (1 .5)] [72 \times \frac{5}{18}] = 25440 W$

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