posted by caroline on .
A water slide can be thought of as being frictionless. Let's say a slider starts from rest and goes down a slide that is 30 m long and is set at a 25 degree incline.
a) Determine the speed of the slider at the bottom of the slide.
b) Explain why you don't need to know the mass of the slider.
PE at top=KE at bottom
mgh=1/2 m v^2
mg30/sinTheta= 1/2 mv^2
solve for v.
sorry, what's mg?
mg is mass * acceleration due to gravity, mg is weight.
so i won't have a numerical answer?
yes,notice m divides out. You have to put the values of g and SinTheta to get the answer. I don't serve on silver platters (just blueplate).