# Q5. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

$\\Time \ taken \ to \ complete \ 40 \ oscillations\ = 4 \ seconds\\ Time \ taken \ to \ complete \ 1 \ oscillation\ = \ \frac{4}{40}\ seconds\ = \ 0.1 \ second\\$
$\\Number \ of \ oscillations \ in \ 4 \ seconds \ = \ 40 \\ Number \ of \ oscillations \ in \ 1 \ second \ = \ \frac{40}{4} \ = \ 10\\ Frequency \ = \ 10 \ Hertz.$