Answer:
20m/s = 72km/h
Explanation:
change 2km=2000m
The speed of the train is
v.t=S <=> v=S/t=2000/100=20 m/s
The correct answer among the choices presented above is option A. Sound waves are considered as mechanical waves because they require a medium in which they can travel through. A mechanical wave is a wave that cannot transmit energy in a vacuum. It needs something to move energy.<span />
<span>They are poor insulators because the electrons in the atom are tightly bound and unable to move between other atoms.
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Answer:
Explanation:
k = spring constant of the spring = 40 Nm⁻¹
A = amplitude of the simple harmonic motion = 4 cm = 0.04 m
m = mass of the block attached to spring = 0.20 kg
w = angular frequency of the simple harmonic motion
Angular frequency of the simple harmonic motion is given as 
= Speed of the block as it pass the equilibrium point
Speed of the block as it pass the equilibrium point is given as
