A car of mass 800kg attains a speed of 25m/s in 20 secs. ...
A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is
1 . 25 x 104 W
2 . 50 x 104 W
1 . 25 x 106W
2 . 50 x 106 W
Correct answer is B
Power = Force x distancetime = m(v−u)t×v
800(25−0)20×25
= 2.5 x 104 watts