The Mechanics Physics Challenge

Welcome to the challenge with six different mechanics topics! Please pay careful attention to the format of your answers. Use basic SI units(kg,m,s) in your answers and leave a blank between the number and the unit. If the question indicates (no units), a whole number answer is correct. A vector answer such as +4 m/s or -4 m/s means the directions right or left. For example: -4 kg*m/s/s is the correct way to enter the answer for 4 Newtons of force to the left. Use g = -10 m/s/s. (- means down)