Momentum, Impulse and Collisions

[xRohan1]

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

 

[haruspex]

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