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August 30, 2014

August 30, 2014

Posted by **yelya** on Thursday, August 25, 2011 at 4:49pm.

- physics -
**Damon**, Thursday, August 25, 2011 at 5:16pmu = constant horizontal speed = 50/2.5 = 20 m/s

v = vi - 9.8 t

at top of arc, t = 2.5/2 = 1.25 seconds and v = 0

so at top

0 = vi - 9.8 (1.25)

so

vi = 12.25

so speed at start = sqrt (20^2 + 12.25^2)

= sqrt(400+ 150) = sqrt 550 = 23.5 m/s

tan angle = 12.25/20

so

angle = 31.5 degrees

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