Aforce of 5n acts on a 15 kg body initially at rest the work done by the force during the first second of the motion of the body is
a) 5j
b)6j
c)5/6j
d)75j

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

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.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.