Posted by **RePost** on Tuesday, September 28, 2010 at 11:54pm.

"You throw a rock at 25m/s at an angle of 25.8511 degrees hitting a target 50m away on the ground in 2.22s." (this is on a flat surface)

Vi=25m/s

Theta=25.8511 degrees

x=50m

t=2.22s

and of course g=9.81m/(s^2)

"How high does the rock fly in the air?"

I know this problem should be a simple plug and solve but my answer does not match the one in the back of my book which is 6.05m. Test coming up and I want to know how to reach that answer or if the book is wrong, what the right answer is.

Please show steps and what equation to use.

- Physics -
**RePost**, Wednesday, September 29, 2010 at 12:17am
my calculator is definitely in degrees

- Physics -
**Damon**, Wednesday, September 29, 2010 at 3:35am
Vi = 25 sin 25.8 = 10.9 m/s up

v = Vi - 9.8 t

how long till v = 0?

9.8 t = 10.9

t = 1.11 seconds

how high?

h = ho + 10.9 (1.11) - 4.9 (1.11)^2

= ho + 12.1 - 6.04

= ho + 6.06

ho is because you rally did not throw the rock from ground level did you?

I did not bother to carry 3 sig figs, you may do so of course

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