# 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.

https://brainmass.com/physics/newtons-second-law/newtons-laws-motion-athlete-67120

#### Solution Preview

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

a) His own weight = mg

b) ...

#### 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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