A0.0780 kg lemming runs off a 5.36 m high cliff at 4.84 m/s. what is its potential energy (pe) when it is 2.00 m above the ground

1.5288 J

Explanation:

We can use the Energy conversion law

Energy can not be made or destroyed. It can only be converted to another form of energy

Potential Energy (PE) is the energy an object has due to its height of the location

PE = mass * gravitational acceleration * height from the ground

Simply here , lemming had a PE and KE also.  

(g = 9.8 m/s²)

PE = 0.0780 * 9.8  *2

     = 1.5288 J

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heat the gas and measure the pressure