Momentum, Impulse and Collisions

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Homework Statement


Two hockey players push each other on the ice. The 86-kg skater moves with a velocity of 2.4 m/s. Find the recoil velocity of the 79-kg skater

Homework Equations


idk

The Attempt at a Solution


86*2.4=79*v2 v2=2.613 m/s

Second problem

Homework Statement


A child drops a 5-g marble on the floor. The marble hits the floor with a velocity of -3.13m/s and rebounds with a velocity of 1.87 m/s. What is the marble's change in momentum? What impulse acts on the marble? What is the force of impact if the marble is in contact with the floor for a time of 2.5 x 10^-3s?

Homework Equations


idk

The Attempt at a Solution


A) (5*1.87)-(5*-3.13)
B)
C)(5*-3.13)/(2.5*10^-3)=-6260N
 

Answers and Replies

  • #2
haruspex
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Homework Equations


idk
Can you not express the principle you used below in general terms?
A) (5*1.87)-(5*-3.13)
Units?
B)
Are you stuck on this?
C)(5*-3.13)/(2.5*10^-3)=-6260N
You need to use the result from A/B
 

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