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September 20, 2014

September 20, 2014

Posted by **Jadelyn** on Sunday, November 29, 2009 at 12:01am.

i tried and I got 2.8972 seconds but it was wrong =(

Thank you!

- PHYSICS -
**drwls**, Sunday, November 29, 2009 at 2:58amWhen the stone takes off, it starts out at at angle of 37 degrees above the horizontal. (That is the complement of 53 degrees). The speed is initially

2*pi*0.55*5 = 17.28 m/s, and the vertical speed component is initially

17.28 sin 37 = 10.40 m/s

The stone spends 10.40/g = 1.06 s going up and an equal time going down, to the elevation where it started, for a total of 2.12 s in the air. You will need to add additional time to that to account for traveling from 0.55 + 0.55 sin 53 = 0.989 meters (the release altitude) to the ground. That is about 0.09 seconds more, for a total of 2.21 seconds

- PHYSICS -
**Jadelyn**, Sunday, November 29, 2009 at 2:25pmThank you so much!!!

I took the sin of 53 deg instead of 37 deg

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