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Unformatted text preview: 102mph (45.6m/s). It is caught by the catcher 60.5ft (18.4m) away at a height of 1.00m and a speed of 97.0mph (43.4m/s). Find (a)the initial kinetic energy of the ball, (b)the final kinetic energy of the ball, (c)the net work done on the ball, (d)the net work done by gravity and (e)the work done by the resistive forces that act on the ball. 4. A 1.20kg block falls onto a relaxed vertical spring with a spring constant of 500N/m. The block drops 15.0cm before coming momentarily to rest. Find (a)the work done by the spring, (b)the work done by gravity, (c)the total work done on the block, and (d)the speed of the block when it fell on the spring. h = 15.0cm v = 0 before o v after...
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 Fall '09
 Kagan
 Energy, Kinetic Energy, Mass

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