Question

A 70.0-kg ice hockey defender, originally at rest near the goal, has a 0.170-kg hockey puck slapped at him at a velocity of 35.5 m/s. Suppose the defender and the puck have an elastic collision, and the puck is reflected back in the direction from which it came. What would the final velocities of the defender and the puck be in this case? Assume that the collision is completely elastic. Number To practice the center-of-mass frame content from Lesson lI18, tackle this problem using a CM frame approach. m/ s defender (That means you won't directly employ conservation of energy, nor relative velocity principle.) Number Note that, for this 1-D problem, there won't be any angles to worry about. m/ s puck

Answer 1

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Let initial velcoity of the puck is u and the initial velcoity of the person is u v\ and v, are the final velocities of masses m, and m2 respectivelyThus, 0.170-70 (35.5m)/s) 0.170+70 =-86.0 m/s Here, negative sign indicates that the object moves in negativex axis The velocity of the person is, 0.170 0.170+ 70 35.5m/s =0, 17 m/s