Answer : The speed of waves along the wire is, 1.2 m/s
Explanation :
Formula used :

where,
= frequency = 
= wavelength =
c = speed of wave = ?
Now put all the given value in the above formula, we get the speed of waves along the wire.


Thus, the speed of waves along the wire is, 1.2 m/s
The force of gravity (mg) is the force of an object in free fall.
Electromagnetic force. It is where alike forces ( negative, negative & positive , positive) repel and opposite forces ( negative & positive ) attract.
Hopes this helped
As we know that P=IV so P = (0.5A)(4.5V)
P= 2.25 watt