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January 28, 2015

January 28, 2015

Posted by **Sandy** on Sunday, September 12, 2010 at 8:51pm.

Determine (a) how long it takes the first rock to hit the ground and (b) at what velocity it hits. Determine (c) how long it takes the second rock to hit the ground and (b) at what velocity it hits.

- Physics -
**bobpursley**, Sunday, September 12, 2010 at 8:56pmBoth are solved the same way:

Hf=hi+vi*t-4.9t^2

put in hi (15), hf(zero), vi (either 12, or-12), and solve for t.

velocity? Vf=Vi-9.8t

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