Help me please

2. - B.

3. - True.

4. - B.

5. - D.

Explanation:

2. To find the speed in feet per minute, you need to divide the time by time and divide the feet by the time

2/2 = 1 minute

100/2 = 50 feet

3. 45 N - 20 N = 15 N

So the difference between the forces is 15 N

4. As just about everyone knows, when something falls, that is because of gravity. Gravity is the force that pulls everything.

5. Inertia is when an object stays unchanged. So if something stays in motion or does not stop, it has not changed

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.