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

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