Posted by **Chris** on Saturday, March 3, 2007 at 9:15pm.

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)

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