Wednesday

January 28, 2015

January 28, 2015

Posted by **monica** on Wednesday, January 5, 2011 at 6:43pm.

7

kg.

If the locomotive can exert a constant pull

of 6.2×10

5

N, how long does it take to increase

the speed of the train from rest to 70 km/h?

Answer in units of min.

- physics! -
**Damon**, Wednesday, January 5, 2011 at 6:48pmF = m a

6.2 * 10^5 = 1.8 * 10^7 a

a = (6.2/1.8)10^-2 m/s^2

v = a t

now what is v

70,000 m/3600 s = 19.4 m/s

so

t = (19.4 * 1.8 /6.2 )* 10^2 seconds

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