Grandpa is on skates and coasting 6 m/s on a long and straightdriveway when she

Question

Grandpa is on skates and coasting 6 m/s on a long and straightdriveway when she sees Dave standing still and watching. When thetwo are abreast of each other, grandpa grabs Tom, lifting Dave intohis arms. If Grandpa weights twice as much as Dave, what is theirspeed together

Explanation / Answer

Let mass of Dave = M => mass of Grandpa = 2M initial velocity of grandpa,V = 6m/s initial velocity of dave =0m/s           as he is standing still Let Velocity after collision = V' Applying law of momentum conversion we have, 2M*6 + M*0 = (M+2M)*V' => 12M = 3M*V' => V' = 4m/s Hence Grandpa and Dave will have 4m/s velocity after collision. Hope this helps you

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