Step 1:

The graph of the function is in the form of ,

where is amplitude, is the period and is the shift along -axis.

Observe the graph.

 The difference between the maximum height and the minimum height is twice of the amplitude of the function.

The amplitude of the function is .

From the graph, the sine curve starts down wards from the origin.

So, consider the period as .

Step 2:

Period of the function is .

The sine function completes one half of the cycle between the times at maximum height and minimum height.

Then Period of the function is .

Step 3:

Phase shift along - axis is the time where minimum height occurs.

The time at minimum height is .

Substitute the values , and in the function .

, , and

.

Solution:

The function is .