Question

Help in 2D kinematics. Help. A woman has been found dead in her car at the bottom of a 100m tall cliff and the car has landed 25m away from the cliff. How long does it take her to hit the bottom of the cliff?

Answer 1

The distance from the cliff (25m) isn't needed since the fall time is solely dependent on the y component of the initial velocity. For this problem the initial y velocity is 0m/s so you can simply use:\[d=\frac{1}{2}gt^2\]\[100m=\frac{1}{2}(9.8m/s^2)t^2\]Just solve the above for t.

Answer 2

Let it not be said that your teacher does not give interesting examples!

Answer 3

\[T=\sqrt{\frac{ 2h }{ g }}\]