Question

The power of an engine which accelerates a car of mass 800 kg to a speed of 72 km/h from rest in 32 sec. is​

Answer 1

Answer:

10kW

15kW

20kW

5kW

Answer :

D

Solution :

Speed of car , v=72km/h=72×518=20ms−1

KE=12mv2=12×800×400=400×400J

P=KETime=400×40032=5000W=5kW

Explanation:

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