You push your couch a distance of 3.9 m across the living room floor with a horizontal force of 220.0 n. the force of friction is 144.0 n. what is the work done by you, by the friction force, by gravity, and by the net force?

The general formula to calculate the work is:

where F is the force, d is the displacement of the couch, and is the angle between the direction of the force and the displacement. Let's apply this formula to the different parts of the problem.

(a) Work done by you: in this case, the force applied is parallel to the displacement of the couch, so and , therefore the work is just equal to the product between the horizontal force you apply to push the couch and the distance the couch has been moved:

(b) work done by the frictional force: the frictional force has opposite direction to the displacement, therefore and . Therefore, we must include a negative sign when we calculate the work done by the frictional force:

(c) The work done by gravity is zero. In fact, gravity (which points downwards) is perpendicular to the displacement of the couch (which is horizontal), therefore and : this means

.

(d) Work done by the net force:

The net force is the difference between the horizontal force applied by you and the frictional force:

And the net force is in the same direction of the displacement, so and and the work done is

its c i just checked it

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min