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## Homework Statement

The equation below describes a physical situation:

1/2(1.70kg)(3.30m/s)

^{2}+ (1.70kg)(9.8m/s

^{2})(2.35m)sin 30º =

1/2(1.70kg)(1.08m/s)

^{2}+ 0.320(1.70kg)(9.8m/s

^{2})(2.35)cos 30º

Which description best fits the equation?

A. A 1.70 kg block slows down while sliding down a frictionless plane inclined at a 30° angle.

B. A 1.70 kg block slows down while sliding down a plane with mk = 0.320, with the plane inclined at a 30° angle.

C. A 1.70 kg block slows down while sliding up a frictionless plane inclined at a 30° angle.

D. A 1.70 kg block slows down while sliding down a plane with mk = 0.320, with the plane inclined at a 30° angle.

E. A 1.70 kg block slides over the top of an inclined plane and then descends on the other side. Both planes, inclined at a 30° angle, have mk = 0.320.

## Homework Equations

1/2mv

^{2}= KE mgh(sin 30) = W by gravity

## The Attempt at a Solution

The equation shows that the block slows down and there is work done by gravity and friction. I just can't justify any of those answers as being correct. Also, you'll notice answer b and d are identical which is odd. Any help would be greatly appreciated.

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