A 500 Kg car ,moves with a velocity of 36 Km/h on a straight road unidirectionally ,doubles its velocity in one minute . the power deliverd by the engine for doubling the velocity is ??
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Power=Force /Time
First we calculate force
Force=ma
where m is mass and a is acceleration of car.
initial velocity=u=10m/sec
Final velocity =v=20m/sec
Time taken. = t= 60 sec
V= u+at
20=10+a×60
a= 1/6m/s^2
F=500×1/6
Power= 500/6×60
Power=1.38W
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