Two identical pucks collide head-on on a frictionless surface

PHYSICS · Subjective · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

Two identical pucks collide head-on on a frictionless surface. Each puck has a mass of

0.16\,\text{kg}

. Before impact, puck 1 moves to the right at

4.5\,\text{m}\!\cdot\!\text{s}^{-1}

and puck 2 moves to the left at

2.0\,\text{m}\!\cdot\!\text{s}^{-1}

. The coefficient of restitution for the collision is

0.40

. Calculate the fraction of the total initial kinetic energy that is lost in the collision. Express your answer as a decimal rounded to two significant figures.

Related theory

Collisions
Linear momentum
Elastic and inelastic collisions
Collisions in one dimension
Work, Energy and Power
Types of collisions (elastic and inelastic)

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