Question

A 0.015kg hockey puck moving at 24m/s is caught and held by a 75kg goalie at rest. With what speed does the goalie slide on the ice?

Answer 1

0.0048m/s

Step-by-step explanation:

Given parameters:

Mass of hockey = 0.015kg

Speed of the puck = 24m/s

Unknown:

Mass of goalie = ?

Solution:

The momentum of puck is a product of its mass and velocity;

Momentum of puck = 0.015 x 24 = 0.36kgm/s

According to the law of conservation of linear momentum,

Momentum gained will be transferred to the goalie;

Speed of goalie =
`(momentum of the puck before it was caught)/(mass of goalie + mass of puck)`

Speed of goalie =
`(0.36)/(0.015 + 75)` = 0.0048m/s