A person throws a 0.21 kg ball straight up into the air. It reaches a height of 10 m. What is the force on the ball as it begins to fall? (The acceleration due
to gravity is 9.81 m/s2)
O A. 4.32 N
B. 4.67 N
C. 1.18N
D. 2.06 N

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.