Physics Help Please~?

[Kankri Vantas]

I need to know how you got your answer.

An object slides on a level surface in the +x direction. It slows and comes to a stop with a constant acceleration of -2.45m/s^2. What is the coefficient of kinetic friction between the object and the floor?

The driver of a motorboat that can move at 10m/s in still water wishes to travel directly across a narrow strait in which the current flows at 5.0m/s, At what angle upstream should the driver head the boat?

A person of mass 60kg is standing on a bathroom scale in an elevator. The reading on the scale is 500 N. What forces are acting on this person?

A parachutist jumps from a plane.
a) What forces are acting on the person before terminal velocity?
b) What forces are acting on the person during terminal velocity?
c) What forces are acting on the person at the moment the parachute has fully opened?

Any that you can answer is appreciated ^-~