Homework Help: Physics

Posted by Shawn on Wednesday, January 6, 2010 at 7:28pm.

The driver accelerates a 240.0 kg snowmobile, which results in a force being exerted that speeds up the snowmobile from 6.00 m/s to 28.0 m/s over a time interval of 60.0 s.

b. What is the snowmobile's change in momentum? What is the impulse on the snowmobile?
c. What is the magnitude of the average force that is exerted on the snowmobile?
I dont understand how to solve this problem exactly, I little confused

Physics - Damon, Wednesday, January 6, 2010 at 7:41pm
final momentum = 240*28 = 6720 kg m/s
original momentum = 240*6 = 1440 kg m/s

change in momentum = 6720-1440 = 5280 kg m/s

impulse = average force * time = change in momentum
so impulse = 5280 kg m/s

average force = (change in momentum or impulse)/time

= 5280 kg m/s / 60 s = 88 kg m/s^2 or Newtons

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