When a substance is heated, the molecules begin to vibrate faster and the space between molecules increases. So it would be speeding up.
Assuming that air resistance is negligible you can use suvat.
you don't know the distance, the initial velocity is 0, the velocity at the point you are trying to work out is v, the acceleration is gravity (9.8ms^-2) and the time is 1.1s.
you use the equation v=u+at which gives v=0+(9.8x1.1)=10.78ms^-1
Answer
given,
Power output of loud train = 100 W
Distance of intensity level from train= 100 m
I₀ = 10⁻¹² W/m²
Intensity of sound = ?
we know,
Intensity level
= 
= 
= 
= 89 dB
You can't tell the relative values of I-1 and I-2 from the information given,
but that's not for any super-technical reason.
The reason is because the drawing doesn't show WHERE in the circuit
I-1 and I-2 are measured.
It makes a BIG difference if they're the currents in the resistors, or
the currents in and out of the battery.
-- The currents in and out of the battery are equal.
-- The current through either resistor is less than
the current in or out of the battery.
-- The sum of the currents through both resistors
is equal to the current in or out of the battery.
-- The currents through the two resistors may be equal
or unequal, and either one may be greater or less than
the other. It all depends on the values of the resistors.
