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Solve the all parts of given problem:

Problem: A 98.7-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is µk = 0.677.

Part A: What is the magnitude of the frictional force?

Part B: If the player comes to rest after 1.21 s, what is his initial speed?

Please explain all work and steps to find the magnitude of the frictional force.

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