When a 0.0780 kg lemming runs off a 5.36 m high cliff at 4.84 m/s. then its total mechanical energy would be 5.015 Joules
What is mechanical energy?
As total mechanical energy is the sum of all the kinetic as well potential energy stored in the system.
ME = KE + PE
As given in the problem a 0.0780 kg lemming runs off a 5.36 m high cliff at 4.84 m/s
m =0.0780 kg
v = 4.84 m/s
h = 5.36 m
the total potential energy
PE = mgh
PE = 0.0780 *9.81*5.36
PE = 4.10 Joules
Similarly The total kinetic energy
KE = 1/2mv²
KE = 0.5*0.0780 *4.84²
KE = 0.9136 Joules
The total mechanical energy is the sum of the potential and kinetic energy
ME = 0.9136 + 4.10
ME =5.015 Joules
Thus, the total mechanical energy would be 5.015 Joules.
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