Questions on momentum and collisions

  • Thread starter John_Locke
  • Start date
  • #1
Hey these could be simple questions with easy formulas and just plugging in but i don't have them my teacher is the worst teacher i have ever had in high school and what help i can get is appreciated


Homework Statement


A 68.0 kg ice skater moving to the right with a velocity of 2.99 m/s throws a 0.15 kg snowball to the right with a velocity of 22.7 m/s relative to the ground.

A second skater initially at rest with a mass of 60.50 kg catches the snowball. What is the velocity of the second skater after catching the snowball in a perfectly inelastic collision?



An 92.8 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 28.7 m behind the ship, at rest relative to the spaceship. The only way to return to the ship without a thruster is to throw a wrench directly away from the ship. If the wrench has a mass of 0.560 kg, and the astronaut throws the wrench with a speed of 18.0 m/s, how long does it take the astronaut to reach the ship?



Homework Equations


none



The Attempt at a Solution


I don't really know where to start but i can figure out the momentum of the skaters
1) Momentum of skater is= p=mv
p=68(2.99)
P=136
Momentum of Snowball p=mv
p=.15(22.7)
p=3.405
for the Astronaut question i use Pi=Pf but i don't know how to break down the equation but i do something with the momentum of the wrench with distance and i don't know an equation for that
 
Last edited:

Answers and Replies

  • #3
thanks hage good website Bookmarked it =D
 

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