A ball initially at rest is dropped from a window 18.6 m off the ground. How long does it take for the ball to reach the ground? Round your answer to 2 decimal places.

Answer 1

Solve this equation for t:
(1/2) g t^2 = H = 18.6 m

Answer 2

is this equation from kinematics?

Answer 3

You should have seen the equation in your text by now. It is the solution to Newton's second law of motion when the acceleration (g) is constant and the initial velocity is zero.
You can call it kinematics, mechanics or physics. When I attended college, kinematics meant something else.