Perfectly inelastic collision

  • Thread starter agadag
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  • #1
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Homework Statement


Kevin has a mass of 84.2 kg and is skating with in-line skates. He sees his 23.2-kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 1.74m/s. Ignoring friction, find Kevin's speed just before he grabbed his brother.


Homework Equations


V= d/t ?
I have no idea how to solve this eqn!
The only eqn i have for perfectly inelastic collision involves center of mass.

PLEASE HELP!!
 

Answers and Replies

  • #2
sylas
Science Advisor
1,647
7

Homework Statement


Kevin has a mass of 84.2 kg and is skating with in-line skates. He sees his 23.2-kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 1.74m/s. Ignoring friction, find Kevin's speed just before he grabbed his brother.


Homework Equations


V= d/t ?
I have no idea how to solve this eqn!
The only eqn i have for perfectly inelastic collision involves center of mass.

PLEASE HELP!!

In an inelastic collision, kinetic energy is lost, but momentum is still conserved. Use conservation of momentum.
 

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