Example (changes in KE & PE of a system):: A ball is thrown in the X-Z plane with initial velocity components of V, 3 m/s and V-4 m/s from h, 0.745m above the ground. the ball reaches a maximum height then falls down and hits the ground as shown in the figure. Assume the ball is subjected to the gravitational force only (g=9.81m/s2). ZA a) find the maximum height the ball reaches. b) find the velocity of the ball when hits the ground.

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Pitch direction A baseball pitcher throws a curveball by spinning and throwing the ball, and the schematic diagram shows the stylized pattem of air flow around the ball on a horizontal plane. As the ball travels in the air, it also spins, causing the air flow velocity on the right of the ball, Vz, to be lower than the air flow velocity on the left, VL. The air has density, p. Air flow around the ball p-12 kg/m VR 15 m/s V 18 m/s g-9.81 m/s Spin direction (a) Which way will the baseball curve? To the left, or to the right? (b) Use Bernoulli's cquation to estimate the magnitude of pressure difference between the left and right sides of the ball, that causes the ball to curve. VL VR