A soccer goalie (m = 65 kg) collides with the goalpost. If she was moving at 8 m/s and comes to rest in 1⁄2 a second, determine:
a) The impulse the post exerts on the player.
b) The impulse the goalie exerts on the post.
c) The average force exerted by the post.
d) The average force exerted by the goalie.