Answer:
elative magnitude of the two forces is the same and they are applied in a constant direction.
Explanation:
Newton's second law states that the sum of the forces is equal to the mass times the acceleration
∑ F = m a
in this case there are two forces on the x axis
F_applied - fr = 0
since they indicate that the velocity is constant, consequently
F_applied = fr
the relative magnitude of the two forces is the same and they are applied in a constant direction.
The answer is refracts parallel to the axis of the lens
Answer:

Explanation:
From the question we are told that:
coefficient of static friction 
Velocity 
Generally the equation for Conservation of energy is mathematically given by



I think it is 1 and 4 hope this helped! ( I am only in middle school)
Answer:
Explanation:
Momentum: has a units of m*v.
mass is a primary unit (kg)
V: derived it is made up of distance (meters) and seconds