A sound wave in air has a pressure amplitude equal to4.10 multiplied by10-3 N/m2. Calculate the displacementamplitude of the wave at a frequency of 9.4 kHz. (Note: Use the following values, asneeded. The equilibrium density of air is rho = 1.20kg/m3; the speed of sound in air is v = 343m/s. Pressure variations ΔP are measuredrelative to atmospheric pressure, 1.013 multiplied by 105Pa.)
m

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

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