What is the velocity of a sound wave that has a frequency of 300 Hz and a wavelength of 10
m?

3000 m/s

Explanation:

The velocity of a sound wave is found by the wavelength times the frequency.  Therefore, the velocity = wavelength*frequency = (10 m)(300 Hz) = 3000 m/s

I hope this helps! :)

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