Homework Help: Physics

Posted by Mark on Monday, February 27, 2012 at 11:19pm.

A 0.1-kg object is traveling to the right (in the positive direction) with a speed of 2 m/s. After a 0.2 s collision, the object is traveling to the left at 3 m/s. What is the magnitude of the impulse (in N-s) acting on the object? The answer must be positive.

Physics - drwls, Monday, February 27, 2012 at 11:26pm
Mass x (velocity change) = 0.1 x 5 kg m/s
= 0.5 N s

(1 kg m/s is the same as 1 N*s)

The duration of the collision doesn't matter in oomputing the impulse, but it does determine the force involved.
Physics - Anonymous, Thursday, March 8, 2012 at 1:18pm
a horizontal force of 100N is used to push a 20 kg box across a level floor for 10 m. how much work is done? how much work is needed to raise the same box by 10m?
Physics - Anonymous, Wednesday, September 26, 2012 at 12:50pm
20,000
Physics - Anonymous, Wednesday, September 26, 2012 at 12:51pm
20000

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