A freight train has a mass of 1.5 E 7 kg. If the locomotive can exert a constant

Question

A freight train has a mass of 1.5 E 7 kg. If the locomotive can exert a constant pull of 7.5 E 5 N, how many minutes does it take to increase the speed of the train from rest to 80 km/hr?
A freight train has a mass of 1.5 E 7 kg. If the locomotive can exert a constant pull of 7.5 E 5 N, how many minutes does it take to increase the speed of the train from rest to 80 km/hr?
A freight train has a mass of 1.5 E 7 kg. If the locomotive can exert a constant pull of 7.5 E 5 N, how many minutes does it take to increase the speed of the train from rest to 80 km/hr?

Explanation / Answer

F = m a

7.5 x 10^5 = (1.5 x 10^7) a

a = 0.05 m/s^2

vf = 80 km/h = 80 x 1000 m / 3600 s = 22.22 m/s

Applying vf = vi + a t

22.22 = 0 + 0.05 t

t = 444.4 sec Or 7.41 min .....Ans

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