# Large Mass But Low Kinetic Energy

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1. Feb 4, 2016

### PrakashPrasad

Can anyone please let me know an example where a body has large mass but low Kinetic Energy? Please provide some reasons for same.

2. Feb 4, 2016

### SDewan

What exactly do you need it for? Then I may be able to help you better.

3. Feb 4, 2016

### PrakashPrasad

I am in need of an example of a body having large mass but low kinetic energy? Please let me some reason for same - is an elephant moving uphill an example of same

4. Feb 4, 2016

### SDewan

Going by the definition, KE=1/2*m*v^2
Just consider a fully loaded truck moving slowly in a traffic jam.
This meets the requirement for a heavy body and low KE. The only thing which is in our control is the velocity. So have as low a velocity as possible.

5. Feb 4, 2016

### A.T.

How about a sleeping elephant?

6. Feb 4, 2016

### SDewan

This case, though meets thecriteria, but is an extreme case.

7. Feb 4, 2016

### Staff: Mentor

How about a tectonic plate. 40E21 kg at 1.6E-9 m/s gives a KE of about 50 kJ, which is only enough energy to power a typical incandescent light bulb for about 20 minutes.

8. Feb 4, 2016

### A.T.

Or how about any massive object in the rest frame of that object?

9. Feb 4, 2016

### Staff: Mentor

Yes I thought about that too, which would make it obviously 0.

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