The graph describes the motion of an object. 1. The object moves with _ from A to B.

2. It _ from B to C.

3. It moves with _ from C to D.

Options for 1st
constant acceleration
positive acceleration
constant velocity

Options for 2nd
remains stationary
it slows down
it speeds up

Options for 3rd
constant acceleration
positive acceleration
constant velocity

1. The object moves with constant from A to B.

2. It remains stationary from B to C.

3. It moves with constant velocity from C to D.

Explanation:

Position vs Time Graph

It shows the change of position of a body over time. If the graph is an increasing line, then the object has positive speed, if it's a decreasing line, it has negative speed, if it's a horizontal line, it's at rest.

The first part of the graph (from A to B) shows an increasing line, which means the object has a position that increases in time, thus the speed is positive and constant.

1. The object moves with constant from A to B.

The second part of the graph shows a horizontal line, which means the object does not change its position in time. It's at rest.

2. It remains stationary from B to C.

The third part shows the object has started to move again with positive and constant speed because the graph is a line:

3. It moves with constant velocity from C to D.

i need the answer to this too but idk it ; -;

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.