Which of the following has the greatest kinetic energy?
a
o
a 20 kg stone traveling at 10 m/s
o
a 40 kg ball traveling at 4 m/s
o
a 30 kg lead pipe traveling at 6 m/s
o
a 50 kg pillow traveling at 2 m/s

a 20 kg stone traveling at 10 m/s.

Explanation:

In this case the Kinetic Energy (KE) is the energy processes due to  the stone's motion. To calculate the energy you should apply the formula as follows:

Now, if you want to know what of the cases has the greatest kinetic energy, you need to calculate each one of these:

1. a 20 kg stone traveling at 10 m/s

2. a 40 kg stone traveling at 4 m/s

3. a 30 kg stone traveling at 6 m/s

4. a 40 kg stone traveling at 4 m/s

Finally, if you compare the results of KE you could conclude that the greatest kinetic energy is 1000 J and correspond to 20 kg stone traveling at 10 m/s.

Rgds!

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.