Aboy uses a slingshot to launch a pebble straight up into the air. the pebble reaches a height of 37.0 m above the launch point 2.3 seconds later. assume air resistance is negligible (a) what was the pebble's initial speed (just after leaving the slingshot)? m/s (b) how much time did it take for the pebble to first reach a height of 18.5 m above its launch point? s

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.