A bar of mass M and length L is pivoted at the top end with a free hinge. It is held at angle 8 = 30 with the horizontal and let go. It swings down and when it is completely vertical it collides with a dense but small box of mass 4M. The box sits on a frictionless horizontal surface and the collision is completely elastic. a} Find the angular momentum ofthe system right atterthe collision. b] Find the speed of the mass right aer the collision. c} Find the maximum angle the bar makes with the vertical after the collision. d) Calculate the energy lost in the collision. \f