Can you please help me select figure out these problems.

11. (7 points) A small earthquake causes a lamppost to begin a slight oscillation back and forth. It's noticed it takes 10.0 seconds to undergo 4 oscillations. When the earthquake ceases, the ampli- tude of the top of the lamppost oscillation is 7.50 cm. Then 9.00 seconds later, that amplitude is 1.60 cm. (a) What is the time constant of the damped oscillation? (b) Sensemaking: In general, what does the time constant represent in a system like this? Would you expect your time constant to be larger or smaller than the given 9 second value? Using this log- ic, explain if your answer to part (a) makes sense