In Fig. 10-72, a 0.400 kg ball is shot directly upward at initial speed 40.0 m/s. What is its angular momentum about P, 2.00 m horizontally from the launch point, when the ball is (a) at maximum height and (b) halfway back to the ground? What is the torque on the ball about P due to the gravitational force when the ball is ( c) at maximum height and (d) halfway back to the ground?

Explanation

(a) Zero, (b) `-22.6kg*m^(2)//s`, (c ) `-7.84N*m`, (d) Due to the way r is defined, it does not matter how far up the ball is and hence the answer is the same as in part ( c).