5) Two identical sinusoidal waves with frequency of 20 Hz travel in the same direction at the same speed. The two waves originate from the same point but with a time difference At. The amplitude of the resultant wave is Ares = AV3. The minimum possible time difference between the starting moments of the two waves is, At =: (a) 1/120 sec (b)0.477 sec (c) 1/80 sec (d)0.716 sec

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!