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Physics / College Physics 1 / Chapter 8 / Problem 30

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

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Solved: A 70.0-kg ice hockey goalie, originally at rest,

Chapter 8, Problem 30

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QUESTION:

Problem 30PE

A 70.0-kg ice hockey goalie, originally at rest, catches a 0.150-kg hockey puck slapped at him at a velocity of 35.0 m/ s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities be in this case?

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QUESTION:

Problem 30PE

A 70.0-kg ice hockey goalie, originally at rest, catches a 0.150-kg hockey puck slapped at him at a velocity of 35.0 m/ s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities be in this case?

ANSWER:

Solution 30PE

The goalie and the hockey puck have an elastic collision. Both momentum and energy in such a collision are conserved.

Step 1 of 2

Let $u{\ }_{g}=$ initial velocity of the goalie, $u{\ }_{p}=$ initial velocity of the puck,

$v{\ }_{g}=$ final velocity of the goalie, $v{\ }_{p}=$ final velocity of the puck, $m{\ }_{g}=$ mass of the goalie, $m{\ }_{p}=$ mass of the puck

Given data:

$u{\ }_{g}=0$

$m{\ }_{g}=70.0$ kg

$u{\ }_{p}=35.0$ m/s

$m{\ }_{p}=0.150$ kg

We are required to calculate $v{\ }_{p}$ and $v{\ }_{g}$ .

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