A 30kg block sits on a ramp, with Θ=47. The ramp is 13m off the ground at the tallest point. If the block slides in the presence of friction, with μ=0.1, how fast is the block moving when it hits the bottom of the ramp?

Question

Please indicate which equation you use, what variable corresponds to each number, and how you got the number that goes with the variable.

Thanks!

bobpursley · Answer

I am beginning see your posts as pure answer grazing, which does not reflect positively on you. You can do better than that.

Her, I would find the answer from energy considerations:

First, the force of friction: mg*mu*cosTheta
then, find the distance down the ramp: 13/sinTheta

KE at bottom=PE at top - frictionwork
1/2 mvf^2=mgh-forcefriction*distance
solve for vf

Tina · Answer

What makes you think I just want answers. I am here to learn and simply showing me how to set up the problem is enough. Your answer was helpful but you don't have to be mean.