# physics

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A freight train has a mass of 1.5 107 kg. If the locomotive can exert a constant pull of 6.9 105 N, how long does it take to increase the speed of the train from rest to 72 km/h?

min

• physics -

i assume you mean the mass is
M = 1.5*10^7 kg

The acceleration is
a = F/M = 6.9*10^5/1.5*10^7 = 0.046 m/s^2

72 km/h = 20 m/s

Divide 20 m/s by the acceleration rate to get the time required.

T = (20 m/s)/(0.046 m/s^2) = _____ s

• physics -

0.98

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