a football player with a mass of 100 kg from runs from rest toward his opponent and hits him with a force of 500 Newtons 5 seconds later what was his momentum before impact

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.

Ithink it is a. but i'm not 100 percent sure.

You need to calculate the string in between two masses