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A student 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

Sagot :

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 = [tex]\vec F.\vec S[/tex]

                                     = [tex]FScos\theta[/tex]

Here, [tex]\theta[/tex] is the angle between force and displacement.

If [tex]\theta =\ 0^{0}[/tex], then work done W = [tex]FScos0[/tex]

                                                   = 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.

anwser C 400j Work x Distance = How much was applied Hope it helps

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