A 97.6-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is μk = 0.555. (a) What is the magnitude of the frictional force?
(b) If the player comes to rest after 1.22 s, what is his initial speed?

Explanation:

From the Question we are told that:

Mass

Coefficient of kinetic friction  

Generally the equation for Frictional force is mathematically given by

Generally the  Newton's equation for Acceleration due to Friction force is mathematically given by

Therefore

found in the nucleus

has mass of one amu