Waves that hit a fixed boundary return to the starting point on the side that it began

opposite
same

Opposite

Explanation:

Waves that hit a fixed boundary return to the starting point on the opposite side that it began.

After striking, the wave gets reflected and it moves in the direction opposite to the initial direction.

Hence, it would mean that waves that hit a fixed boundary return to the starting point on the opposite direction.

if they have a finite resultant

c) power lifting, will be your answer.

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