Yes , increased tension suggests increased molecular attraction between the molecules of the ropes which affect the increase in the speed of wave.
the average kinetic energy of the particles in an object is directly proportional to its TEMPERATURE.
in case you dont want to read the answer is B
Answer:
In D: 3J
Explanation:
Potential energy: Ep=mgh where m is the mass, h altitude.
In point A: h=20cm=0.2m
Epa=12=0.2×mg. Thus mg=12/0.2=60N
For point D: hd=5cm=0.05m
Epd=mg×0.05=60×0.05=3J
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