During walking, a 90 kg older adult starts at rest and begins moving (on carpet, coefficient of friction of 0.55) with a horizontal velocity of 0.95 m/s and a vertical velocity of 0.10 m/s. It takes them 0.45 seconds to reach these velocities. This movement comes as a result of a GRF that is directed upward and forward above the horizontal. The only other force in the problem is friction apposing their motion and gravity. How large is the GRF and the frictional force in this situation.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.