Posted by **michaela** on Thursday, April 22, 2010 at 8:11pm.

A 10,000 kg frieight car is rolling along a track at 3.0 m/s. Calculate the time needed for a force of 1000 N to stop the car.

- physics -
**bobpursley**, Thursday, April 22, 2010 at 8:12pm
force*time= mass*changeinvelocity

1000t=10,000*3

solve for t,in seconds

- physics -
**Damon**, Thursday, April 22, 2010 at 8:14pm
Force = change in momentum/change in time = ma

1000 = (10,000*3)/ change in time

change in time = 10*3 = 30 seconds

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