Using Kinematics Equations: Part 1
You can solve all sorts of problems involving constant acceleration with the equations of kinematics. Check out this short and fun animation to see how you can find the height of a clifftop just by measuring how long it takes a stone to fall to the bottom!
With the time taken to fall being known, you can use the kinematic equation:
s = u*dt + 1/2 * dt^2.
Since the object falls from rest, the initial speed is zero and so the first term disappears. Knowing also that the acceleration of free fall is 9.81 m/s^2, the equation becomes:
s = 1/2 * 9.81 * 2.5^2
which gives the height of the cliff:
s = 30.6 m
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