Question

A rock is thrown from on a cliff with the velocity of 15 m/s at an angle of 30 degrees. it takes the rock 6.30 seconds to hit the ground. how high was the cliff?

Answer 1

hfinal=hinitial+Vi*t-4.9t^2

you have hfinal=0, t, Vi=15sin30, solve for hinitial

Answer 2

Where does the 4.9 come from though?

Answer 3

1/2 g= 4.9

Answer 4

Oh, is it .5 multiplied by the acceleration of gravity?

Answer 5

yes.

Answer 6

Alright. Thank you so much for your help!