# Determination of the acceleration of free fall using electromagnet and 2 light gates?

A steel sphere is released from an electromagnet and falls under gravity. As it falls, it passes through 2 light gates which switch an electronic timer on and off.
Now we know how long a freely falling object takes to pass through a known distance, assuming air resistance is negligible.
So how is the...
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A steel sphere is released from an electromagnet and falls under gravity. As it falls, it passes through 2 light gates which switch an electronic timer on and off.

Now we know how long a freely falling object takes to pass through a known distance, assuming air resistance is negligible.

So how is the acceleration of free fall calculated?

I need equations! thanks!

Now we know how long a freely falling object takes to pass through a known distance, assuming air resistance is negligible.

So how is the acceleration of free fall calculated?

I need equations! thanks!

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