Homework Help: Physics

Posted by Alex on Monday, January 14, 2013 at 12:37pm.

a stone thrown from ground level returns to the same level of projection 4s after. with what speed was the stone thrown? Take g=10 m/s2

Physics - Scott, Monday, January 14, 2013 at 6:01pm
2 s up and 2 s down

the velocity took 2 s to drop to zero (at the peak of the flight)

so it must have started at 20 m/s

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