A horizontal spring with spring constant 110 N/m is compressed 16 cm and used to launch a 2.7 kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface is 0.15. Use work and energy to find how far the box slidesacross the rough surface before stopping.

0.35 m

Explanation:

We are given that  

Spring constant,

Length,l=16 cm=

1 m=100 cm

Mass,m=2.7 kg

Coefficient of kinetic friction,

Initial potential energy,0

Final potential energy,

According to law of conservation of energy  

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.