Arock is dropped off a cliff and falls the first half of the distance to the ground in 2.0 seconds. how long will it take to fall the second half?

The answer is 0.83 seconds.

Explanation:

The formula of free fall is following:

Where g=9.8 m/s^2 and t=2 seconds, the rock takes:

19.6 meters. This is the half distance of the cliff. The whole distance is 39.2 meters. So it takes:

2.83 second to fall down completely. The rock takes the second half of the cliff in 0.83 seconds

We have the given 12 m/s and what is asked is how does it long to take to land 60 m away...

Divide the total distance by the average speed per second...

We have :

So we have the final answer as 5 seconds...

Hope this helps