Tuesday
September 16, 2014

Homework Help: physics

Posted by Chris on Sunday, March 4, 2007 at 9:28am.

A cart of mass 340 g moving on a frictionless linear air track at an initial speed of 1.2 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision the first cart continues in its original direction at .66m/s.
a) what is the mass of the second cart?
b)What is its speed after impact?
c)What is the speed of the two-cart center of mass?

I know that in an elastic collsion momentum and energy is conserved. What would be the equation i would use for this problem? I can't figure out the equations for a) and b) but I think for
c) would I use V= (m_1* v_1 + m_2 *v_2)/(m1+m2)

Why are you looking for "the" equation? Why dont you just solve them from the conservation of momentum and energy?
on a) I would start with momentum. That will give you the final momentum of car two.
Then, use conservation of energy to get final energy of car two. Both of those will yield mass, and speed.
On c, conservation of momentum: the equation
totalmass*speedcm= m1v1 + m2v2
you are right.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics 1 - A cart with mass 340 g moving on a frictionless linear air track at ...
physics - A cart of mass 340 g moving on a frictionless linear air track at an ...
physics - a 4.0-kg cart rolling east on a level, frictionless track at 14 m/s ...
physics - two air carts of mass m1=0.87kg and m2=0.48kg are placed on a ...
Physics Help - A small, 200 g cart is moving at 1.50 m/s on an air track when it...
Physics -Conservation of Momentum- - 1) A 1 kg mass moving at 1 m/s has a ...
Physics -Conservation of Momentum- - 1) A 1 kg mass moving at 1 m/s has a ...
Physics - An air-track cart of mass 0.10 is moving with a speed 1.2 to the right...
Physics ~really need help!~ - 1) A 1 kg mass moving at 1 m/s has a totally ...
Physics - A cart of mass m1 = 12 kg slides down a frictionless ramp and is made ...

Search
Members