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**Calculating uncertainty in a problem??**

Hi I have a quick question:

You drop a ball(with zero initial velocity) from the top of a building. If you measure the acceleration to be 9.8 +/- 0.1 m/s^2 and the height of the building to be 30 +/- 1 m, what is the final velocity?

So you would use the equation

V(final)^2 = V(initial)^2 +2ad

v= [(2)(9.81)(30)]^0.5

v=24.249 m/s

Can you explain how to determine the uncertainty of the answer? Thank you!

The ANSWER given was : 24.2 +/- 0.5 m/s