Posted by **Hannah** on Friday, June 1, 2012 at 2:36pm.

A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 71 kg, and the height of the water slide is 12.0 m. If the kinetic frictional force does -7.4 × 103 J of work, how fast is the student going at the bottom of the slide? Use g = 9.81 m/s2

Could I use the equation

vf=sqrt v0^2 + 2(g)(h0-hf) ?

- Physics(Please respond) -
**bobpursley**, Friday, June 1, 2012 at 3:23pm
No, not that equation.

final KE=initial PE - frictional loss

1/2 m vf^2=m*g*(12)-7.4E3

solve for vf

- Physics(Please respond) -
**Hannah**, Friday, June 1, 2012 at 5:05pm
so for m

- Physics(Please respond) -
**Hannah**, Friday, June 1, 2012 at 5:06pm
So for m I would plug in 71kg correct?

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