Question

A track star in the long jump goes into the jump at 12 m/s and launches herself at 20 degrees above the horizontal. How long is she in the air before returning to Earth? (g= 9.81 m/s squared)

I tried using some formulas but I'm using all of the wrong formulas for this question. I can work this out if someone can give me the correct formula to use. :)

Thanks!

Answer 1

You know the intial height, and the final height. You know the initial velocity.

hfinal=hinitial + v*sin20*t -1/2 g t^2

solve for t.

Answer 2

Thanks! ^^

Answer 3

200

Answer 4

0.83 seconds