A rock is thrown upward with a velocity of 22 meters per second from the top of a 23 meter high cliff, and it misses the cliff on the way back down. When will the rock be 10 meters from ground level?

Guest Feb 12, 2020

#1**+1 **

A rock is thrown upward with a velocity of 22 meters per second from the top of a 23 meter high cliff, and it misses the cliff on the way back down. When will the rock be 10 meters from ground level?

Omi67 Feb 12, 2020

#2**+2 **

xf = x0 + vo t + 1/2 a t^2 xf = 10 m x0 = 23 m vo = 22 m/s a = - 9.9 m/s^2

10 = 23 + 22 t - 4.9 t^2

0 = - 4.9t^{2} + 22t + 13 Use quadratic formula to find t = 5.02 s and - .529 s (throw out)

ElectricPavlov Feb 12, 2020