A fighter jet is flying in a tight circle with a radius of 250m. It makes one complete turn in 20 seconds. How fast is the plane flying?

1 Answer
Dec 14, 2017

(Assuming a constant speed)

79 ms^-1 (2s.f.)

Explanation:

The distance of the plane's path around the circle is given by the formula 2pir. Since the radius is 250m, the circumference is 2pi * 250, which is equal to 500pi metres.

Now using this distance in the standard speed, distance & time relationship:

s = d/t

s = (500pi)/ 20

s = 25pi m

s = 79 ms^-1 (2s.f.)