Question

A kid on a playground swing makes 6 complete to-and-fro swings each 30 seconds

Answer 1

i assume that you want to find out what's the frequency is.

Number of oscillation = 6 which being done in 30 second.

which means the time period for 1 oscillation is 30 second/6 = 5 second


Frequency = 1/time period
= 1/5 Hertz

Hope this help