Sally and Justin are preparing for time trials in the bobsled race. To begin the

Question

Sally and Justin are preparing for time trials in the bobsled race. To begin the race, Sally must push Justin and the bobsled to the edge of a hill that is 28 m high. To do so, Sally applies a force of 48 N over 12 m. Justin and the sled have a combined mass of 64 kg. Assume that the ice track is frictionless.

What is the velocity of Justin and bobsled at the bottom of the hill?

Explanation / Answer

F = 48 => ma = 48 a = 48/64 = 0.75 v^2- u^2 = 2as s=12 so v^2 = 18 now applying conservation of energy 0.5 M v^2 + M(9.8) 28 = 0.5 M V'^2 V' = 23.8 m/s

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