Calvin pushes a lawnmower 20 meters with a force of 2 n. how much work has he done?

none
20 nm
22 nm
40 nm

Work is done when a force is applid to an object in motion. It is calculated by multiplying the amount force applied to the object and the distance the object travels.

Work = force x distance
Work = 2 N x 20 m
Work = 40 Nm

Thus, the answer is the 4th option which is 40 Nm.

And a) oxygen i believe

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .