Answer:
4.0s
Step-by-step explanation:
The period of the pendulum is the time taken for it to complete 1 full oscillation. This means that the pendulum moves this way for it to be 1 oscillation:
P ➟ Q ➟ R ➟ Q ➟ P
Since the pendulum only moved back to midpoint Q and not back to P, it has completed less than 1 oscillation.
Let each movement to the next section be 1 unit.
So 1 oscillation - 4units
In this case, the pendulum moved 3 units.
3 units ----- 3s
1 unit ----- 3÷3
1 unit ----- 1s
Thus 1 full oscillation would take 4(1)= 4s
Therefore, period of pendulum= 4s.