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February 27, 2015

February 27, 2015

Posted by **Franklin** on Wednesday, October 3, 2012 at 7:19pm.

2. The "hang time" of a punt is measured to be 3.50 s. If the ball was kicked at an angle of 61.0° above the horizontal and was caught at the same level from which it was kicked, what was its initial speed? (Neglect air resistance.)

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**Elena**, Thursday, October 4, 2012 at 3:06pm1.The speed at the highest point is equal to v(x) since v(y) = 0 =>

v(x)=v₀/6.

v₀(x) =v(x) =v₀•cosα= v₀/6.

cosα=1/6=0.167,

α =arccos0.167=80.41°.

2.

t= 2vₒ•sinα/g

vₒ=g•t/2•sinα=9.8•3.5/2•sin61°=19.6 m/s

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