Question

A car X moving of mass 500kg accelerates at 1m/s2 when the force due to the engine is 600N.


Starting from rest, a car of mass 1000kg accelerates steadily to 20m/s in 10 secs. What is the average power developed

Answer 1

2. V = Vo +a*t
20 = 0 + a*10,
a = 2 m/s^2.

F = M*a = 1000 * 2 = 2,000 N.

P = F*V/2 = 2000 * 20/2 = 20,000J/s = 20,000 Watts.