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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Two identical ice hockey pucks, labeled A and B, are sliding towards each other at speed v. Which one of the following statements is true concerning their momenta and kinetic energies?

(a) p A = p B  and  K E A  =  K E B

(b) p A = p B  and  K E A  =  K E B

(c) p A = p B  and  K E A  =  K E B

(d) p A = p B  and  K E A  =  K E B

To determine
The momentum and kinetic energy of the two identical pucks.

Explanation

Considering the mass of the two identical pucks is m . And the puck A is moving along positive direction.

Expression for the kinetic energy of the puck A is,

KEA=12mv2 (I)

Expression for the momentum of the puck A is,

PA=mv (II)

As the both pucks are sliding towards each other, considering the speed of the puck B is in negative direction.

Expression for the kinetic energy of the puck B is,

KEB=12m(v)2=12mv2 (III)

Expression for the momentum of the puck B is,

PB

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