Posted by **Anonymous** on Thursday, April 12, 2012 at 8:42pm.

Roger (mass of 75 kg) is travelling on a new ride called the Riddler's Revenge.

On a 7.1 m hill he is moving along at 31.3 m/s, then slows down to 24.7 m/s on the second hill.

How high is the second hill?

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