Physics help, speed, collision?

Question

A small, 200 g cart is moving at 1.90 m/s on an air track when it collides with a larger, 5.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s.

Part A -

What is the speed of the large cart after the collision?

Answer 1

0.200 * 1.90 = - 0.200 * 0.890 + 5.00v

v = 0.112 m/s.