A train of mass 1600kg attains a speed of 25ms ... - JAMB Physics 2022 Question
A train of mass 1600kg attains a speed of 25ms\(^{-1}\) in 20 seconds. The power developed in the engine is?
A
2.5 KW
B
80 KW
C
25 KW
D
50 KW
correct option: d
Let:
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
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