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Q & A: trajectory times

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Most recent answer: 02/11/2013
Q:
I have a question that I am confused about. A rock is propelled upward from the earth with an initial velocity of 60 m/s. It will return to earth in approximately 12s is the answer that was given for this question. If the equation for velocity is v=a X t and "a" is the constant 9.8 m/second squared how is the answer 12s instead of 6s?
- Mel
A:
First up, then down.

Mike W.

(published on 02/11/2013)

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