Hi, I need help with these 3 conserved momentum theorem using the formula: (Pa2) + (Pb2) = (Pa1) + (Pb1) 1) A 2575 kg van runs into the back of a 825 kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road can be negligible,find the initial speed of the van. 2) A 0.115 kg hockey puck moving at 35.0 m/s strikes a 0.265 kg octopus thrown onto the ice by a hockey fan. The puck and octopus slide off together. Find their velocity. 3) A 50 kg woman riding on a 10 kg cart is moving east at 5.0. The woman jumps off the front of the cart and hits the ground at 7.0 eastward. Relative to the ground. Find the velocity of the cart after the woman jumps off. Any help in solving theses 3 will be appreciated.