a) A 500. kg canan fires a 100. kg clown at a velocity of 15 m/s to the right. What is the recoil velocity of the canon after the clown is fired out? b) The starting lever in a pinball machine is attached to a coiled spring having a spring constant of 600 N/m . A 0.250 kg steel ball is positioned in contact with the spring. The spring is capable of elongating 0.150 m before it breaks contact with the ball. The lever releases the spring, sending the ball rolling forward with speed v1 where it collides with an identical steel ball at rest inside the game. If ball 1 has a speed of 3.00 m/s after it rebounds off ball 2, what is ball 2's final velocity ? Neglect friction. (Hint: v1 may be obtained by the conservation of energy transfer of PE(spring) to KE(ball)