Work / kinetic energy

**^_^Engineer_Adam^_^** · August 25th 2007, 02:47 AM

A baseball pitcher throws a fastball that leaves his hand at a speed of 36.0m/s. The mass of the baseball is 0.145kg. Ignore air resistance. How much work has the pitcher done on the ball in throwing it?

I dunno what to use

$W = \frac{1}{2}m{v_{2}}^2 - \frac{1}{2}m{v_{1}}^2$
help please

the answer is 94.0 Joules

**CaptainBlack** · August 25th 2007, 03:23 AM

Originally Posted by ^_^Engineer_Adam^_^

A baseball pitcher throws a fastball that leaves his hand at a speed of 36.0m/s. The mass of the baseball is 0.145kg. Ignore air resistance. How much work has the pitcher done on the ball in throwing it?

I dunno what to use

$W = \frac{1}{2}m{v_{2}}^2 - \frac{1}{2}m{v_{1}}^2$
help please

the answer is 94.0 Joules

The work done is equal to the change in KE of the ball. In this case the initial
KE is zero (zero speed), and the final KE is $\frac{0.145\times 36^2}{2}$

RonL

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