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December 20, 2014

December 20, 2014

Posted by **sandhya** on Tuesday, May 1, 2012 at 5:49am.

a)how long is the ball in the air

b)how far from the base of the house does it land?

c)what is its speed just before landing?

- physics -
**Elena**, Tuesday, May 1, 2012 at 8:09amv(ox) = v•cosα =5•cos30 = 4.33 m/s,

v(x) = v(ox) = 4.33 m/s,

v(oy) = v•sinα =5•sin30 = 2.5m/s.

h =v(oy) •t+g•t^2/2,

4.9•t^2 +2.5•t-7 =0

t = 1.05 s.

L =v(ox) •t = 4.33•1.05 = 4.55 m

v(y) = v(oy) + g•t = 2.5 +9.8•1.05 = 12.8 m/s,

v=sqrt{v(x)^2 + v(y)^2} = 13.5 m/s.

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