Ground reaction forces are measured during a sprinter's third step on the track. The peak result. ground reaction force is 1,242 N (denoted by F in the figure below), and this acts at an angle of above the horizontal (denoted by 0 in the figure below). The sprinter has a mass of 65 kg and the horizontal drag force acting on her is 35 N. What is the magnitude of the resultant force (i.e. the combined effect of the ground reaction force, weight, ar drag) acting on her at this instant in time?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!