Here's some questions from a friends homework that we submitted online. I think the answers that the professor marked are wrong. If they are right please explain it to me. 1) A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of My answer: less than 1 unit of momentum Correct answer: more than 1 unit of momentum 2) A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. What is the jet's acceleration in meters per second per second when taking off? I'm not sure if I'm right or he is, but i used F = ma and got 1/2 m/s^2. Correct answer: 2 m/s^2 3)A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined mass moves at I said 1/6 m/s. Correct answer 1/3 m/s. I guess it depends on how you interpret the phrase "slide toward each other at 1 m/s" 4) A 5000-kg freight car moving at 2 m/s runs into a 10,000-kg freight car at rest. They couple upon collision and move away as one body at My answer: 2/3 m/s Correct answer: 2 m/s Someone please explain to me how a small object hitting a stationary bigger object can make them both move at the same speed the smaller object was moving before the collision. 5)Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. (50N is a force equal to roughly a 10 pound weight.) The tissue paper is held in midair - no wall, no tricks. You agree or disagree? Why can't you exert a force of 50N on a piece of tissue paper? Is it because the paper rips? What if the paper is not held securely and the paper could move? Could you then exert 50N of force on it?