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**final velocity of a ball pushed by compressed air..pls. help!!**

## Homework Statement

Compressed air is used to fire a 1.72 kg ball vertically upward from a 1.50 m long

tube. The air exerts a upward force of 28.7 N on the ball as long as it is in the tube.

With what velocity does the ball leave the top of the tube?

## Homework Equations

F=ma

V

_{1}

^{2}= v

_{0}

^{2}+2ad

## The Attempt at a Solution

so i used the given mass and force to get an acceleration. then using the acceleration i plugged it in to the second equation assuming vinitial to be zero and my asnwer is coming out wrong can someone point me in the right direction thanx