In what direction does the medium move relative to the direction of the wave? explain.

As we can see that the boy is moving his hand up and down while producing the wave in the string.

Here we can see that the source of disturbance or source of wave here in this example is the boy who is holding the string at one end.

So here the motion of the hand of boy is representing the motion of medium molecules in the medium always

So here the disturbance of wave is travelling in the string to the right direction while if we see the direction of medium molecules then it is moving perpendicular to the string i.e. up and down

This type of wave is known as transverse waves in which medium molecules moves perpendicular to the direction of wave

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