Astudent pushes a 40-n block across the floor for a distance of 10 m. how much work was applied to move the block?
a.
4 j
b.
40 j
c.
400 j
d.
4000 j

The correct answer to the question is C) 400 J.

CALCULATION:

As per the question, the force applied on the block F = 40 N.

The distance travelled by the block S = 10 m.

We are asked to calculate the work done by the block.

The work done by a body under a force F is calculated as -

             Work done W =

                                     =

Here, is the angle between force and displacement.

If , then work done W =

                                                   = FS.     [ cos0 = 1]

Hence, the work done by the block W = FS

                                                                = 40 N × 10 m

                                                                =  400 Joule.         [ans]

Here, Joule is the unit of work.

Hence, the work done by the block s 400 Joule.

b) 10 minutes

girls stopped for 10 minutes.