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Physics projectile help!

A pencil is accidentally knocked off the edge of a (horizontal) desk top. The height of the desk is 64.8cm and the pencil hits the floor a horizontal distance of 32.4cm from the edge of the desk. What was the speed of the pencil as it left the desk.
Use suvat vertically to find t. You know s, u (assuming it is knocked off purely horizontally) and a.

And then horizontally use suvat to find u. As you'll have found t, and will know s and a.

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