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January 30, 2015

January 30, 2015

Posted by **smh** on Thursday, February 16, 2012 at 5:39pm.

min

- physics -
**drwls**, Thursday, February 16, 2012 at 8:26pmi 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

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