A car accelerates from rest to 100 m/s in 10 seconds. If mass of the car is 50 kg then power developed by the engine is: (Select all that apply)
25 KW
35 KW
The change in kinetic energy of the car would be equal to the work done by the engine. Since power is work done per unit time, so change in kinetic energy of the car and the time taken for that change would give us the power developed by the engine i.e.
Work done =12×m×v2
=12×50×1002
=250000 J
Power=25000010
=25000 W=25 KW