Question #233827

For his daily training, an athlete runs around a 15 m radius track five times in 2.5 minutes. What is his average speed in m/s?


1
Expert's answer
2021-09-07T09:50:47-0400

Given:

R=15mR=15\:\rm m

t=2.5min=150  st=2.5\:\rm min=150\;\rm s

n=5n=5


The period of rotation

T=tN=150s5=30sT=\frac{t}{N}=\frac{150\:\rm s}{5}=30\: \rm s

The average speed

v=2πRT=6.2815  m30s=19m/sv=\frac{2\pi R}{T}=\frac{6.28*15\;\rm m}{30\:\rm s}=19\:\rm m/s


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