A 57g tennis ball is dropped from 1.22 m onto a hard surface, bouncing up to a maximum height of 0.70 m. a)What was the kinetic energy of the ball just before it hit the ground for the first time?
b)How much kinetic energy must the ball have when leaving the ground to bounce to the height of 0.70m?
c)Explain why the two energies in part (a) and (b) are different.

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

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.