V=r/t
Speed equals displacement over the time
V=100/9.92=10.08ms^-1
Answer:
a) 
b) 
Explanation:
given,
n =1.5 for glass surface
n = 1 for air
incidence angle = 45°
using Fresnel equation of reflectivity of S and P polarized light

using snell's law to calculate θ t


a) 

b) 

You can't see beyond a blind turn, so a mirror would allow you to see around the corner.