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August 20, 2014

Homework Help: Physics

Posted by Jess on Sunday, September 9, 2007 at 3:50pm.

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about ?

-Hfinal=hinitial+ vinitial*t -4.9t^2
0=0+10t-4.9t^2 when I solved for t I got .49t. Also, where did 4.9 come from?

A man leans over the edge of a cliff and throws a rock upward at 4.9m/s. How far below the level from which it was thrown is the rock 2 seconds later?

-Hfinal=Hinitial+Vi*t - 4.9t2
hfinal=0+4.9m/s*2 s -4.9t^2, then I get hfianl=9.8m/s/s-4.9^2, I dont dont what to do next?

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