Question

time period of a simple pendulum is 1.5 seconds. how much time will take to complete 9 oscillations?

Answer 1

9*1.5 =13.5s
it will take 13.5 seconds

Answer 2

you can find it by directly multiplying -time taken for 1 oscillation with the no of oscillations . i.e

=9*1.5
=13.5 sec