Aworker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. force a is the force exerted by the worker and force b is the force of friction due to the surface. what is the relationship between a and b?
a > b
a = b
a< b
it will not slow down, but continue moving at constant velocity.

Explanation:

A work pulls the crate by horizontal force on it

Now due to this applied force crate is moving horizontally with uniform speed

so we can say that the acceleration of the crate will be zero

now by Newton's II law we can say

so here we will have

here we know that applied force is A

so F = A

and friction force is B

so correct relation is

c.the charges if the proton and electron and gravity