Use a(t) = −9.8 meters per second per second as the acceleration due to gravity. (Neglect air resistance.)

Question

A canyon is 2500 meters deep at its deepest point. A rock is dropped from the rim above this point. How long will it take the rock to hit the canyon floor? (Round your answer to one decimal place.)

Answer 1

Using kinematic formula for free falling: h = gt²/2;

from here t = sqrt(2h/g) = (2·2500m/9.8m/sec²)^1/2 = 22.6 sec