Select the correct answer.

Two friends are sitting on a seesaw at the park. The height, h(t), of the left seat, in inches above the ground, is modeled by a sine function. Let

trepresent the time, in seconds, since the friends started seesawing.

t

0

1

2.

3

4

5

6

ht)

24

48

24

0

24

48

24

If the friends start seesawing with the plank in a level position, how long does it take for the friend in the left seat to move upward, downward,

and then back to the initial position?