Question

A football is kicked from ground level with an initial velocity of 20.4 m/s at angle of 47.0° above the horizontal. How long, in seconds, is the football in the air before it hits the ground? Ignore air resistance.

Answers

just find when the height is zero
20.4 sin47° t - 4.9t^2 = 0
t = (20.4 sin47°)/4.9

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