The atoms of blue paper blue light.

The atoms of blue paper reflects blue light.

Explanation:

It is the characteristics property of matter that it absorb all the colours of light except the colour of that object.

So, a blue coloured paper absorb all the colours of light except blue, so it appears blue.

reflect

Explanation: when light wave is incident on a material atoms in that material absorbs all the bands of colour in the light wave and reflects blue because that's not absorbed

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

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