I really need some help with the question on momentum and collisions

1. Kevin and Justin have a body slam competition on Skates. Kevin (60kg) and Justin (65kg) skate into each other with the same velocity (8m/s). Justin continues forward with a velocity of 0.1m/s. They experience a collision.
a. What is Kevin’s final velocity?
b. What impulse did Kevin experience?
c. If the collision took 0.2 seconds, what force did Kevin feel?
d. Who won?


Please indicate which equation you use, what variable corresponds to each number, and how you got the number that goes with the variable.

Thanks!

Assuming they move as 1 unit after the collision, and that Justin's initial velocity is +,

a) Vfk = .1 m/s (same as Justin's)

b) Pk = Mk*dVk = 60*(-8.1) = -486 N∙s

c) Fk = Pk/t = -486/.2 = -2430 N

d) Define the criterion for 'winning'...?