- #1

Stephen Garner

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## Homework Statement

The school football team has asked you for advice. During kickoffs the ball is not going far enough. The team's kicker shows you his kicks, and you figure out that he consistently kicks the ball so that it leaves his foot moving at 72 km/h.

a) Predict the best angle for him to try to kick the ball so that it will go as far as possible. [a: 45 degrees]

## Homework Equations

X-component: cosΘ = adj/hyp

Y-Component: sinΘ = opp/hyp

v

_{f}

^{2}= v

_{i2}/ + 2ad

## The Attempt at a Solution

I have converted 72 km/h to m/s.

72 * 1000 = 72000 / 3600 = 20m/s

I am confused because course has not asked us to predict an angle given such little data. Am I suppose to use gravity somewhere in here? I don't know how they arrived at 45 degrees.