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## Homework Statement

A solid uniform marble and a block of ice, each with the same mass, start from rest at the same height H above the bottom of a hill and move down it. The marble rolls without slipping, but the ice slides without friction.

Find the speed of each of these objects when it reaches the bottom of the hill.

Vice:?

Vmarble:?

## Homework Equations

1/m v^2 = mgh

## The Attempt at a Solution

Ice:

1/2 mv^2=mgh

v= squareroot 2gh

Marble:

mgh=1/2 mv^2 + 1/2 I ω^2

=1/2 mv^2 +1/2(2/5 mr^2) (v/r)^2

The answers i entered in were marked incorrect by masteringphysics.

Please advise!!!!!!!! : (