Acar on a roller coaster starts at zero speed at an elevation above the ground of 26 m. it coasts down a slope, and then climbs a hill. the top of the hill is at an elevation of 16 m. what is the speed of the car at the top of the hill? neglect any frictional effects. a) 9 m/s b) 18 m/s c) 14 m/s d) 6 m/s e) 10 m/s

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.