Question

PLEASE HELP!!! ASAP The function graphed approximates the height of a rock, in meters, x seconds after it falls from a cliff

after about how many seconds is the rock 20 m above the ground

1.5 s
1.9s
2.2s
2.7s ​

Answer 1

2.2 seconds

Explanation:

The attached graph shows the height of a rock after it falls from a cliff. Let after t seconds the rock is 20 meters from the ground.

If the graph is not given we can calculate the time using the second equation of motion i.e.

`d=ut+(1)/(2)at^2`

Where

u is the initial speed of the rock

a is the acceleration of the rock

t is the time taken

Here, distance covered is in y axis and the time taken is in x axis. Approximately, at 2.2 seconds the rock is 20 meters above the ground. Hence, this is the required solution.

Answer 2

The vertical numbers are the distance and the horizontal numbers are the time in seconds.

Look at where the line is located at the number 20.

It si between the 2 and the 3 on the horizontal line, but you can see it is closer to the 2 than it is the 3, so the time would be 2.2s