Sprinting near the end of a race a runner with a mass of 60 kg accelerate from a speed of 60 mi./s to speed of 70 mi./s in two seconds respond to both ANB explain how you arrived at your answers. (A)how far away from the finish line was the runner when she began her sprint? (B) To gain speed run and produces a backward force on the ground so that the ground pushes the runner for providing the force necessary for acceleration calculate the average force.

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.