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
James W.
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.)

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