Why is the acceleration not equal to 9.81 m/s^2

1. The problem statement, all variables and given/known data

I’m doing a lab where there is a pulley system. A mass of 50g is attached to a string that goes through the pulley, which is then attached to a puck, on a frictionless air table. So when the mass is let go, the 50g pulls down the puck to the edge of the table.

So why isn’t the acceleration of the puck = 9.81 m/s^2, knowing that the 50g mass is in free fall, pulling the puck?

I got an average acceleration of 33.69 cm/s^2.

Would I be correct to say that it’s because the force of gravity would equal the acceleration of the puck? So I would multiply 0.05 kg by 981 cm/s^2 to get an answer of 49.05 cm/s (which would be the acceleration I should’ve gotten, instead of 33.69 cm/s^2). Is this at all correct? …or am I completely off?

Thanks in advance!

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