|Dec11-07, 10:27 PM||#1|
kinetic friction problem
1. The problem statement, all variables and given/known data
A baseball player slides into third base with an initial speed of 7.90 m/s. If the coefficient of kinetic friction between the player and the ground is .41, how far does the player slide before coming to rest?
2. Relevant equations
3. The attempt at a solution
I have absolutely no idea how to solve this question.
|Dec11-07, 10:53 PM||#2|
I'll start it for you:
f(net) = ma
f(friction) = ma
mu(k)*g*m = ma
mu(k)*g = a
Then you can use these two formulas and you should be able to solve it:
a = (v(final)-v(initial))/t
d = 1/2*a*t^2 + v(initial)t
Just a hint: remember that g is negative.
|Dec11-07, 10:55 PM||#3|
The energy the player expends sliding is frictional force times distance. The initial energy of the player coming in is (1/2)*m*v^2. Equate them.
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