Question

A runner begins to sprint along a 100 meter track. When he passes the 10 meter mark his trainer beings timing him. The runner passes the 80 meter mark at 4.32 seconds. What is the runners speed?

Answer 1

The speed is 16.2 m/s

Explanation:

Assuming the runner is moving by uniform motion (=at constant velocity), then we can find his speed by using the equation:

$v=\frac{d}{t}$

where

v is the speed

d is the distance covered

t is the time elapsed

For the runner in this problem, we have:

The initial position is 10 m while the  final position is 80 metres, so the distance covered is

d = 80 - 10 = 70 m

While the time elapsed to cover these 70 m is

t = 4.32 s

Therefore, substituting into the equation, we find the speed:

$v=\frac{70}{4.32}=16.2 m/s$

Learn more about speed:

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