A projectile of mass 0.15 kg is fired horizontally giving it a speed of 10 m/s from the top of a cliff of height h = 2m. The projectile slides across the flat rough surface, friction causing it to
slow down (ux = 0.6). The projectile, with its new smaller speed falls from the cliff landing a
distance x away from the base of the cliff.
a) With what horizontal velocity does the projectile leave the cliff?
b) How far does the projectile land, distance x measured from the base of the cliff?
c) With what speed does the projectile hit the floor?
25 200 cm
kl.
2

answer: a. same unit

explanation:

its a 5.5 n

glad that

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.

a sonic boom is a loud boom that breaks the sound barrier

explanation: