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September 21, 2014

September 21, 2014

Posted by **Anonymous** on Tuesday, November 18, 2008 at 9:23pm.

A) Which arrow goes the farthest?

B) Which arrow goes the highest?

C) Which arrows go the same horizontal distance?

D) Which arrow is in the air for the shortest time?

Please help me out, let me know how to do it.

- Physics -
**bobpursley**, Tuesday, November 18, 2008 at 9:34pmFirst, the time in air:

h=visin45*time -1/2 g time^2

so when does the arrow return to base height?

0=visin45*time-1/2 g t^2

0=(visin45-1/2 g t)t

or time in air is 2*vi*sin45/g

height: when is vv=0?

vv=visin45-gt which is zero at

time=vi*sin45/g

hmax=vi*sin45*vi*sin45/g-1/2 g (visin45/g)^2 or

hmax=1/2 (vi*sin45/g)^2

and so on. for the other angles, put those numbers in and see, the only variable is the sine of the angle.

- Physics -
**Anonymous**, Tuesday, November 18, 2008 at 9:46pmohh okay. thanks.

- Physics -

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