1) An astronaut is 100 m away from her spaceship doing repairs with a 10 kg wrench. The astronaut's total mass is 90 kg and the ship has a mass of 1 x 104 kg. If she throws the wrench in the opposite direction of the spaceship at 10 m/s how ling would it take for her to reach the ship? 2) Two blocks collide on a frictionless surface. Afterwards, they have a combined mass of 10 kg and a speed of 2.5 m/s. Before the collision, one of the blocks was at rest. This block had a mass of 8 kg. What was the mass and initial speed of the second block? 3) Larry and Jerry are riding together in an amusement park bumper car a 10 m/s, with a total mass = 300 kg. They bump Marissa's car, mass 125 kg, which is standing still. a. Calculate the total momentum of the system before the collision. b. After the elastic collision, the boys continue ahead with a speed of 4 m/s Calculate their new momentum. c. Using the law of conservation of momentum, what must Melinda's new momentum be? d. How fast is Melinda's car bumped across the