Askater is standing still on a frictionless rink. herfriend
throws a frisbee straight at her. in which of the followingcases is
the largest momentum transferred to the skater?
a) the skater catches the frisbee and hols onto it.
b) the sjater catches the frisbee momentarily, but then
dropsit vertically downward.
c) the skater catches the frisbee, holds it momentarily,
andthrows it back to her friend.

option C

Explanation:

the correct answer is option C

Skater is standing on the frictionless surface when her friend through Frisbee at her he starts moving in the backward direction as there is no friction acting to stop him.  

but when again the skater through Frisbee back to his friend there is backward force which will increase the velocity of the skater.

so, momentum is directly proportional to velocity so, velocity increases momentum also increases.

so easy. just google the electromagnetic waves and it’ll pop up.

3. dark matter

empty space could also be a simple vacuum