Question

PLEASE HELP M IN THE MIDDLE OF A TEST

A rock is thrown upward with a velocity of 12 meters per second from the top of a 25 meter high cliff, and it misses the cliff on the way back down. When will the rock be 3 meters from ground level? Round your answer to two decimal places.

Answer 1

find t when

25 + 12t - 5t^2 = 3

using g=10 (easier than using 9.81)