phycis
posted by martin .
A roller coaster has two hills and starts from rest atop the first hill , which is the higher of the two hills . The secound hill increases if the height of the initial hill is increased by 20m

Your question makes no sense to me.

The roller coaster can not make it to the top of the second hill if the first hill is not higher.
(1/2) m v^2 + m g h = constant
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