With its wheels locked, a van slides down a hill inclined at 40.0° to the horizonta l. Find the acceleration of this van A) if the hill is icy and frictionless, and B) if the coefficient of kinetic friction is 0.20.

Explanation:

Check attachment for solution

the average speed is 24.57 km/hr

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).