Question 14 of 20 A dog running with an initial speed of 7.5 m/s comes to a stop in 5 seconds. What is the dog's displacement?
Eq: d = 1/2 (Vi+Vf) *t
(1 point)
UA. Om
LIB. 7.5 m
NC. 37.5 m
LED. 18.8 m
Question 15 of 20
An shiort with an initial speed of 4.0 m/s accelerates uniformly at 2.0 m/s2 in the direction of its motion for a distance of 5.0 me

the closer the planet is to the sun, the larger the gravity

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.