A5.00 kilogram block slides along a horizontal, frictionless surface at 10.0 meters per second. for 4.00 seconds. the magnitude of the blocks momentum is ?
a)200 kg m/s
b)50.0 kg m/s
c)20.0 kg m/s
d)12.5 kg m/s

It's B. They are trying to trick you by adding the time so you would divide the speed by time, which then you multiply to 5 and get D's answer. Ignore the time. The time does not matter. just multiply 5 and 10 to get 50.

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.

Aliquid is an answer i hope this