Answer:
62.5 miles per hour
Explanation:
Speed = Distance travelled / Time taken
Speed = 125/2 = 62.5
You derive the units of the speed...by using the speed formula....,
Speed = Distance/Time
Speed = miles/hour
Hence the units for the speed = miles/hour
63360
5280 feet*12 inches in every foot=63360
Answer:
B. Two waves have displaced in opposite directions
Explanation:
Interference occurs when two waves meet at a point in space. When this occurs, two extreme conditions can occur:
- if the two waves are in phase (=displacement in the same direction), the amplitude of the resultant wave is equal to the sum of the amplitudes of the two waves:
A = A1 + A2
and this condition is called constructive interference
- if the two waves are in anti-phase (=displacement in opposite directions), the amplitude of the resultant wave is equal to the difference of the amplitudes of the two waves:
A = |A1 - A2|
and this condition is called destructive interference. Note that if A1=A2, the amplitude of the resultant wave is zero.
