In an exciting game, a baseball player manages to slide safely into second base. the mass of the player is 80.9 kg and the coefficient of kinetic friction between the ground and the player is .48
a. find the magnitude of the frictional force
b. if the player takes 1.4s to come to rest what was his initial velocity

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)