Runner which has the weakest force is A.
The speed of any moving object is the ratio of the distance covered and the time taken to cover that distance.
The image attached shows the times for runners in a 100 m dash.
Force = mass x Acceleration
Force = mass x Velocity /Time
If each runner has the same mass, runner with the maximum time has the weakest or lowest force.
Among all the four runners, Runner A has the highest time for completing 100 m dash.
Thus, Runner A has the weakest force.
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