Posted by **Jimmy** on Saturday, September 10, 2011 at 6:35am.

A ball is thrown straight up and passes point B(at a height of 45.6m above its starting point O) in 4.9s

What was its initial speed? The acceleration of gravity is 9.8m/s^2

Answer in units of m/s.

I think the answer is -14.7m/s

but im not sure since you probably cant have negative speed

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