A 500 kg car, moving with a velocity of 36 km h^(-1) on a straight road undirectionally, doubles its velocity in one minute. The power delivered by the engine for doubling the velocity is

A 500 kg car, moving with a velocity of 36 km h^(-1) on a straight roa

1.	A 500 kg car, moving with a velocity of 36 km h^(-1) on a straight road undirectionally, doubles its velocity in one minute. The power delivered by the engine for doubling the velocity is
Answer» 750 W 1050 W 1150 W 1250 W SOLUTION :`u = 10 ms^(-1), v = 20 ms^(-1)` According to work ENERGY theorem Work done = change in kinetic energy = `1/2 mv^2 - 1/2 m u^2` `= 1/2 xx 500 [20^2 - 10^2] = (500 xx 30 xx 10)/(2)` The power delivered by the engine is `P=(500 xx 30 xx 10)/(2 xx 60) W = 1250 W`