Plz help me and how do I calculate “joules” to get my answer...?

  20 Newtons

Explanation:

In this context, 1 J = (1 N)(1 m).

  work = force × distance

  40 N·m = force × (2 m)

  (40 N·m)/(2 m) = 20 N = force

The applied force is 20 Newtons.

Newtons and Joules are "derived" SI units.

  N = kg·m/s²

  J = kg·m²/s² = N·m

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.