If a Doppler radar receives a frequency that are lower than the original frequency, it can be said that the object is moving
(toward/away) from the radar.

question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

b.transmitters send radio waves, and receivers capture radio waves.

the answer is b, have negligible mass

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