A cart with mass 220 g moving on a frictionless linear air track at an initial speed of 1.0 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 0.44 m/s.
(a) What is the mass of the second cart?
___g
(b) What is its speed after impact?
___m/s