Askydiver has reached the point where the force of air resistance equals the force of gravity. until she opens her parachute, her acceleration will a) remain at 0 m/s2. b) continue increasing. c) continue decreasing. d) remain at 9.8 m/s2.

A) remain at 0 m/s2.

Explanation:

A skydiver has reached the point where the force of air resistance equals the force of gravity. Until she opens her parachute, her acceleration will

A) remain at 0 m/s2.

B) continue increasing.

C) continue decreasing.

D) remain at 9.8 m/s2.

resistive force is the force exerted by air on an object passing through it.

at the point point where the force of air resistance equals the force of gravity.we say the sky driver has reached the terminal speed

Terminal speed is the speed at which the force from the weight of the skydriver equals the force of air resistance, so the acceleration is zero. when the change in velocity is zero, then the acceleration becomes zero.

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.