Question

An air hockey table works by pumping air through thousands of tiny holes in a table to support light pucks. this allows the pucks to move around on cushions of air with very little resistance. one of these pucks has a mass of 0.25 kg and is pushed along by a 12.0 N force for 9.0 s.
A. What is the puck's acceleration?
B. What is the puck's final velocity?
A. You can find the acceleration by using the equation Fnet=ma. We know that the Fnet is 12, and the mass is 0.25, so the new equation is 12=0.25a. Simply divide by 0.25, and a=48 m/s^2.
B. Simply use the equation v=v0+at. We know everything but the time, so simply plug in and divide to find that the time is 432 seconds.
Happy physics! :D
How do you know the initial velocity?

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