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Problem: In a typical greyhound race, a dog accelerates to a speed of 20m/s over a distance of 30m. It then maintains this speed. What would be a greyhound's time in the 100m dash? Assume constant acceleration for the first period.

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UAM/Kinematic equations:

 vf = v0 +atx= (vf+v02)tx= v0t+12at2 vf2= v02 +2ax

Acceleration:

a = ?

Δx = 30 m

vf = 20 m/s

v0 = 0 m/s

t = ?

Use the last equation:

a = (vf2 - v02)/2Δx = (202 - 0)/(2 × 30) = 6.67 m/s

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Problem Details

In a typical greyhound race, a dog accelerates to a speed of 20m/s over a distance of 30m. It then maintains this speed. What would be a greyhound's time in the 100m dash? Assume constant acceleration for the first period.

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