posted by Danielle .
A small, 300 g cart is moving at 1.90 m/s on an air track when it collides with a larger, 2.00 g cart at rest. After the collision, the small cart recoils at 0.820 m/s. What is the speed of the large cart after the collision?
You will have to use conservation of momentum
You list the other as "larger" 2g..which is not larger. At any rate, solve for v2'