1. an arrow is shot with an initial velocity of 60.0 m/s at an angle of 30.0° above the horizontal. what is the maximum height it will reach?
a. 23 m
b. 46 m
c. 69 m
d. 92 m
2. a projectile is launched horizontally from a cliff with an initial speed of 40 m/s. the cliff is 125 m high and the projectile travels a horizontal distance of 200 m from the bottom of the cliff. what is the speed of the projectile right before it hits the ground?
a. 48 m/s
b. 52 m/s
c. 56 m/s
d. 60 m/s
e. 64 m/s

root word, prefixes, and suffixes

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.

its lower due to the doppler effect.: apex