[two waves] pass a point [every second]... The answer is in the question (B)
I think The coastal areas were highly polluted
Newton's 2nd law of motion:
Net Force = (mass) x (acceleration) .
The law shows the relationship among an object's mass
and acceleration, and the net force acting on it.
If you know any two of the quantities in the formula,
the law can be used to calculate the third one.
Answer:
Can't see anything, please share clearly
