A train of mass 1600 kg attains a speed of 25 ms−1...
A train of mass 1600 kg attains a speed of 25 ms−1 in 20 seconds. The power developed in the engine is?
2.5 KW
80 KW
25 KW
50 KW
Correct answer is D
where force = f, mass = m, acceleration = a, velocity = v, time = t
Force = m * a → m * \frac{Δv}{t}
Power = f * v
P = m * \frac{v}{t} * v = m * \frac{v^2}{t}
p = \frac{1600 * 25^2}{20}
p = 50,000 or 50 KW