Transmission of messages in a communication is:
a. a one-way street.
b. a two-way street.
c. only through a medium.
d. any which way.

The correct answer is "a two-way street".

Explanation:

Two-way communication is different from a one-way communication.

When one person sends a message and the message is received by another person who is receiver. Here, receiver provides feedback to the sender. Telephonic conversation is a two-way communication.

One way communication: Here, the message flows from the sender to the receiver only. There is no feedback provided to the sender. For example, television program.

Therefore, transmission of messages in a communication is a two-way street.

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