# physics

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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.

• physics -

PE at top=KE at bottom
mgh=1/2 m v^2
mg30/sinTheta= 1/2 mv^2
solve for v.

• physics -

sorry, what's mg?

• physics -

mg is mass * acceleration due to gravity, mg is weight.

• physics -

so i won't have a numerical answer?

• physics -

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).

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