A block of mass m is projected across a horizontal surface with an initial speed v. It slides until it stops due to the friction force between the block and the surface. The surface is now tilted at 20° and the block is projected up the surface with the same initial speed, v. Assume that the friction force remains the same as when the block was sliding on the horizontal surface. When the block
comes to rest momentarily, how does its total mechanical energy compare to the case where the block slid horizontally comes to rest?
1.It is the same.
2.It is less in the case where the block went up the slope.
3.It is more in the case where the block went up the slope.
4.We cannot tell from the information given.
3
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