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 is the final speed of the puck?Group of answer choices35.1 m/s35.0 m/s34.9 m/s34.8 m/s

Question
Asked Oct 24, 2019
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 is the final speed of the puck?
Group of answer choices
35.1 m/s
35.0 m/s
34.9 m/s
34.8 m/s
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Expert Answer

Step 1

the final velocity in elastic collision is 

2M
m+M
m M
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2M m+M m M

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Step 2

substitute the given values in the above eq...

0.150kg70.0kg
2(70.0kg)
|(0m/s)
0.150kg 70.0kg
(35.0m/s)+
0.150kg+70.0kg
-34.85m/s
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0.150kg70.0kg 2(70.0kg) |(0m/s) 0.150kg 70.0kg (35.0m/s)+ 0.150kg+70.0kg -34.85m/s

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