Gayle runs at a speed of 4.60 m/s and dives on a sled, initially
at rest on the top of a frictionless snow covered hill. After she
has descended a vertical distance of 5.00 m, her brother, who is
initially at rest, hops on her back and together they continue down
the hill. What is their speed at the bottom of the hill if the
total vertical drop is 18.0 m? Gayle's mass is 50.0 kg, the sled
has a mass of 5.00 kg and her brother has a mass of 30.0 kg.
m/s
speed at the bottom of the hill =17.411m/s
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