Posted by **Patel** on Sunday, November 21, 2010 at 10:10pm.

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.

- Physics -
**drwls**, Sunday, November 21, 2010 at 10:17pm
Solve this equation for t:

(1/2) g t^2 = H = 18.6 m

- Physics -
**Patel**, Sunday, November 21, 2010 at 10:30pm
is this equation from kinematics?

- Physics -
**drwls**, Monday, November 22, 2010 at 12:42am
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.

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