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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

A 25.0-g object moving to the right at 20.0 cm/s overtakes and collides elastically with a 10.0-g object moving in the same direction at 15.0 cm/s. Find the velocity of each object after the collision.

To determine
The velocities of the objects after collision.

Explanation

From the conservation of momentum,

(25.0g)v1f+(10.0g)v2f=(25.0g)(20.0cm/s)+(10.0g)(15.0cm/s)(25.0g)v1f+v2f=65.0cm/s (I)

  • v1f is the velocity of the first object after collision
  • v2f is the velocity of the second object after collision

For head-on collision,

v1iv2i=(v1fv2f)

20

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