A sled and rider with a total mass of 54 kg are given an initial push of 10 m/s at the top of a hill. The top of this hi

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A sled and rider with a total mass of 54 kg are given an initial
push of 10 m/s at the top of a hill. The top of this hill is 56 m
above the low point in the path of the sled. A second hump in the
hill is 37 m above this low point. Suppose that we also know that
approximately 1,670 J of work is done against friction as the sled
travels between these two points and 1,242 J from the 2nd hill down
to the lowest point. What is the velocity at the top
of the 2nd hill? Use g = 9.8 m/s^2