If an object is dropped from rest off a 10.5m high building, how long does it take to hit the ground?

We can calculate the time it takes for the object to hit the ground by using the following equation:

where S=10.5 m is the initial height of the object, is the free-fall acceleration and t is the time. Re-arranging the equation, we can solve for the time:

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

mistakes are ok