A 0.150kg glider is moving to the right (+x) on a frictionless, horizontal air track with a speed of 0.80m/s. It has an elastic collision with a 0.300kg glider moving to the left (-x) with a speed of 2.20m/s.
a.) What is the initial momentum of each glider? Express the momentum in terms of unit vectors.
b.) Use the relative velocity formula to find v2f in terms of v1f.
c.) Use the relative velocity result to solve conservation of momentum to find the velocity (magnitude and direction) of each glider after the collision.
d.) Show that kinetic energy is conserved.
@Mathematics

Question

A 0.150kg glider is moving to the right (+x) on a frictionless, horizontal air track with a speed of 0.80m/s.  It has an elastic collision with a 0.300kg glider moving to the left (-x) with a speed of 2.20m/s.
a.) What is the initial momentum of each glider?  Express the momentum in terms of unit vectors.
b.) Use the relative velocity formula to find v2f in terms of v1f.
c.) Use the relative velocity result to solve conservation of momentum to find the velocity (magnitude and direction) of each glider after the collision.  
d.) Show that kinetic energy is conserved.
   @Mathematics

anonymous · Answer

I've figured out part a.) using formula for momentum

anonymous · Answer

P=mv

anonymous · Answer

Not sure how to do b or c though

anonymous · Answer

I dont know the relative velocity formula

anonymous · Answer

v2f-v1f=-e(v2i-v1i)

anonymous · Answer

Where are you getting that from?

anonymous · Answer

elastic - perfectly

anonymous · Answer

?

anonymous · Answer

e=1 that elastic collision for this equation

anonymous · Answer

How do you know e = 1?