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The Tension Force, Equilibrium Applications in Newton’s Second Law?

I was absent today, any help with the Physics would be greatly appreciated!
Thanks!
A 92kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is uk=0.61. (a) What is the magnitude of the frictional force? (b) If the player comes to rest after 1.2s what is his initial speed?

a) Friction force = coefficient of friction (mu) times normal force.

The normal force is equal to his weight: mg

So friction force = mu * m * g

They give you mu and m. You know g. Plugnchug.

b) His acceleration is mu * g

time to stop = initial velocity / acceleration

So v initial = at = mu * g * t

2) The two foces have a vertical component of F * cos (45). So together, they have a vertical compenent of 2F cos (45) = F sqrt (2). So if F sqrt (2) = weight = mg, then
F = mg / sqrt (2)

3) I need to see a picture to do this. The key is that the sum of the forces and the sum of the torques has to be zero.

Sum of forces = T1 + T2 – mg = 0
Sum of torques = ? = 0

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