Sample Problem

Sample Problem

A child of mass m is released from rest at the top of a water slide, at height h = 8.S m above the bottom of the slide.

SOLUTION: A Key Idea here is that we cannot find her speed at the bottom by using her acceleration along the slide as we might have in earlier chapters.

System: Because the only force doing work on the child is the gravitational force, we choose the child-Earth system as our system.  which we take to be isolated.

slide as she descends a '" ;. height h
slide as she descends a 
height h

Now that we have worked this sample problem, return to the puck example in the first paragraph of Chapter 7. See if you can show that the puck’s speed at the track is 5.0 m.

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