Aball is dropped from rest from the top of a building and strikes the ground with a speed . from ground level, a second ball is thrown straight upward at the same instant that the first ball is dropped. the initial speed of the second ball is , the same speed with which the first ball eventually strikes the ground. ignoring air resistance, decide whether the balls cross paths

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.