Answer: B) equals to
Explanation:
The motion of the sled is of a constant acceleration thus newton's laws of motion applies.
By referring to newton's second law of motion, the mathematical Equation that defines the movement of the sled is given as
F - Fr = ma
F= applied firce
Fr = frictional force
m = mass of object
a = acceleration of the sled.
When the force is applied, the sled moves with a constant velocity and as this happens the acceleration is zero (a=0), slotting this into the equation, we have that
F - Fr = m(0).
F - Fr = 0
Thus F = Fr
Which implies that applied force (F) equals frictional force (Fr).
Option B
