Posted by **Shane** on Monday, November 16, 2009 at 5:42pm.

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process?

- Physics -
**bobpursley**, Monday, November 16, 2009 at 5:45pm
initial PE=FinalKE-thermalenergylost

mgh=1/2mv^2-thermalenergy lost.

- Physics -
**Anonymous**, Tuesday, November 1, 2011 at 1:48pm
a 0.145 kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s.if the contact time between bat and ball is 0000.3 s,calculate the average force between the ball and bat during contact.

- Physics -
**Anonymous**, Wednesday, October 2, 2013 at 10:21pm
325J

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