# Newton's Laws of Motion

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An athlete whose mass is m is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs w. He lifts the barbell a distance of x in a time of t.

Use Newton's laws to find the total force that his feet exert on the ground as he lifts the barbell.

Take free fall acceleration to be g.

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##### Solution Summary

This problem of an athlete lifting a barbell has been solved using Newton's second law to find the total force that his feet exert on the ground as he lifts the barbell.

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When the athlete is lifting the weight, the forces acting on the ground through his feet are :

a) His own weight = mg

b) ...

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