# physics

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a skier moving at 15 m/s down a 20 degree slope encounters a region of wet snow of coefficient of friction is 0.8. how far down the slope does she go before stopping

• physics -

Beginning energy: 1/2 m 15^2
lost energy while slowing: mg*(cos20)*(mu)distance

gained energy while slowing: mg (d/sin20)

final energy=0

finalenergy=betinning enrgy+gained energy-lost energy

0=1/2 m 15^2+mg*d/sin20-.8 mg*(cos20)*d

solve for diistance d

• physics -

The mass is not given in the problem, does that mean it cancels out?

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