The andromeda galaxy, unlike most other galaxies, has a. red shift. c. blue shift. b. green shift. d. no observable shift.

blue shift.

Explanation:

Red-shift and blue shifts result from Doppler effect of light. When there is relative motion between two bodies, the light received from the source seems to have higher frequency (blue-shift) if it approaches the observer and appears to have lower frequency (red-shift) if it recedes away.

Universe is expanding. So, the light received from most of the galaxies is red-shifted. Andromeda galaxy is approaching towards the Earth. Thus, the light from the Andromeda is blue-shifted.

explanation: look here

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