In a two-person bobsled race, the first few seconds of the run are crucial. During a practice run on a flat ice surface, where the coefficient of kinetic friction for the sled is 8.00 x 10^-3, the sled accelerates at 4.00 m/s^2 [forward] when one person pushes with a force of 503 N [forward] and the second person pushes with a force of 496 N [forward]. (a) Describe the reaction force to the people pushing forward on the sled. (b) Describe the reaction force to the force of friction pulling backward on the sled.

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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.