6. During an elastic collision, if my = 2m, and v2 = -~ V, , calculate the velocities of (K:1, I:1) the two masses after collision in terms of v, . 7. A 35.0 g of baseball travels with a speed of 10.0 m/s travels to the right was hit by a baseball bat. It then changed the direction backwards at a speed of 25.5 m/s. If the contact time was 0.05 s, what was the force applied on this baseball? (K:1, A:2) 8. A cart with no initial velocity, rolls down a track as shown below. If the cart must travel at 9.0 m/s at the top of the circle. Determine the initial height required. (A:2) 20.0 m