Question

The graph shows the distance y, in feet, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x.

How many seconds are required for the pendulum to move from its resting position, swing in one direction and return to its resting position?

Enter your answer in the box.

Answer 1

2.5

Explanation:

The answer is 2.5 because it is asking how far along the X axis does it go until the line crosses again.

Answer 2

2.5 seconds

Explanation:

Resting position is at y = zero which mean x intercept

So, we need to find the time between two consecutive points of intersection with the x-axis.

Which mean it is the half period of the given function as it is a sine wave

From the graph we can deduce that

2.5 seconds are required for the pendulum to move from its resting position, swing in one direction and return to its resting position.