A child sleds down a frictionless hill with vertical drop h. At the bottom is a...
A child sleds down a frictionless hill with vertical drop h. At the bottom is a level stretch where the coefficient of friction is 0.27.
If she slides 19 m across the level stretch, what's h? Express your answer with the appropriate units.
Homework Answers
kinetic energy of child at bottom = potentail energy at top
= m*g*h
Workdone by friction = chnage in kinetic energy on frictional surface
Friction*d*cos(180) = KEF - KEi
-mue_k*N*d = 0 - m*g*h
-mue_k*m*g*d = -m*g*h
==> h = mue_k*d
= 0.27*19
= 5.13 m <<<<<<<-------------Answer
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