Question

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

Answer 1

Now for this problem, what is given is a 40 Newtons which would represent the force to be applied to the object, and a distance of 10 meters after the application of the said force. When these two combine, work is done. The unit for work is Joules and this is what we are looking for. The formula to get Joules or for work would be the force applied to the object multiplied by the distance that it travelled after the application of the force. It looks like this

work = force x distance
Joules = Newtons x meter

so let us substitute the variables to their corresponding places

Joules = 40 N x 10 m
Joules = 400 J

So the answer to this question would be C. 400 J

Answer 2

Answer: The correct answer is option(B).

Explanation:

Force applied on the block = 40 N

Displacement of the block = 10 m

Work done is defined as product of force applied on an object into displacement of an object.

Work done = $Force\times Displacement$

Work done to move the block:$40 N\times 10 m= 40 N m=40 Joules$

40 Joules of work was applied to move the block . Hence, the correct answer is option (B).