Colleen jumped 90 times in one minute. what is her rate of jumps per second?

To solve this problem you must apply the proccedure shown below:

You have that Colleen jumped ninety times in one minute and we know that there is sixty seconds in one minute. Therefore, you only need to divide the number of jumps per minute given in the exercise, by sixty seconds, as following:

Therefore, the answer is: 1.5 jumps per second.

it would rotate about 180 degrees.