PLS HELP 1.) When there are equal forces from opposite directions acting on an object, the forces are said to be which of the following? (4 points)

A.) Positive

B.) Negative

C.) Balanced

D.) Gravitational

2.) If you want to cause an object to move, what should you do? (4 points)

A.) Apply balanced forces.

B.) Apply neutral forces.

C.) Apply potential forces

D.) Apply unbalanced forces.

B

Explanation:

260 miles per hour

explanation:

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.