How does the momentum of a 75 kilogram stationary football player compare with that of a 70 kilogram player moving at a velocity of 6 meters/second?
the 70 kilogram player has momentum whereas the 75 kilogram stationary player has none.
the 75 kilogram player has more momentum than the 70 kilogram stationary player.
both players have the same momentum.
the 75 kilogram player has momentum whereas the 70-kilogram stationary player has none.
neither player has momentum.
i'm thinking its can someone ?

This question is easier to think about if you ignore all the numbers
and just consider that one man is moving and the other one isn't. 

Momentum is proportional to speed, so the man who's moving
has momentum, and the man who's not moving doesn't have any.

If a crests of two waves line up and double the height of the wave, they are said to be interfering constructively.

When two waves come across each other, they get superimposed. When two waves are super imposed, the resulting wave is the sum of the individual waves at that point. Sometimes, the waves are in phase with each other, i.e the crests and troughs of the waves coincide. When this happens, the resulting wave has a height that is double the height of the individual waves.

From this we can see that the correct answer for this question is (B), constructive interference is occurring.