1.If a man has an average useful power output of 49.0 W, what is the minimum time, in s, it would take him to lift fifty 13.0 kg boxes a height of 1.2m
2. A car with momentum 4875.0 kg m/s is travelling at a speed of 39.0 m/s. What is the car's weight? Express your answer in the S.I. unit for weight.
3. An 112.0 kg astronaut is motionless in space far away from the Earth and his spaceship. He's holding a container of minerals he's collected, which has a mass of 1.8 kg. He decides to throw the container away from him and manages to move in the opposite direction at a speed of 0.12 m/s relative to his rest position. At what speed (in m/s) did he throw the container? Give your answer as a positive value without including a sign.
4. Assume you are given two objects whose centre of mass is located exactly at the origin. The first object has a mass of 30.0 kg and is located at position +54.0 m with respect to the origin. If the mass of the second object is 8.4 kg, what is its position (in m) with respect to the origin? (Include the sign if the answer is negative, and no sign if the answer is positive.)
5. A car weighing 1975.0 N has momentum 4843.0 kg m/s. At what speed is it travelling? Express your answer in km/h.