D. Destructive interference. An easy way to think about it is the waves are opposite each other, so they essentially cancel each other out, or make an effort to.
The answer is yes. You know this because the table isn't moving or rotating.
Answer:

Explanation:
Given:
't' hour be the time taken for travel by both the vehicles and 'd' be the distance between then
then
Distance traveled by the car = 20 × t miles
and
Distance traveled by the truck = 50 × t miles
now, using the Pythagoras theorem

or

or

or

thus, the equation relating the distance 'd' with the time 't' comes as

Answer:
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Explanation: