Answer:1.27
Explanation:
Given
incident angle 
refracted angle 
Suppose  is the refractive index of material then using Snell's law we  can write
 is the refractive index of material then using Snell's law we  can write

where  =refractive index of air
=refractive index of air



 
        
             
        
        
        
Force = Work/distance
Force = 150/10
           =  15 Newtons
Force = 15 Newtons
Therefore, 15 newtons of force is applied to the body when 150 joules of work
is done in displacing the body through a distance of 10m in the  direction of the force.
 
        
             
        
        
        
Answer:
45 degrees 
Explanation:
The textbooks say that the maximum range for projectile motion (with no air resistance) is 45 degrees.