Three gliders are moving with velocities as shown along a frictionless air track. If the cars all collide at the same time and stick together, find: a. The magnitude and direction of their velocity after the collision. b. How much kinetic energy is lost in the collision? Note: m1 = 1.5 kg, v1 = 5.00 m/s m2 = 2.0 kg, v2 = 0.75 m/s m3 = 1.0 kg, v3 = 1.50 m/s