A child has legs that are each 0.500 m long. What is her maximum walking speed?

A. 2.21 m/s

B. 2.19 m/s

C. 2.6 m/s

D. 5.58 m/s

If a child has legs of length 0.500m long, to calculate the maximum walking speed, use this formula:

s = √gl

s=walking speed, g=acceleration due to gravity that is 9.8m/s2 and l is the length of legs which is 0.500m

so,

s = √ (9.8) (0.500)

s=√4.9

s=2.21m/s

so A is the correct option, her maximum walking speed is 2.21 m/s.