At 2.5 seconds, the helicopter has a kinetic energy of 20 j. what is its mechanical energy at that time?

Mechanical energy is the sum of kinetic and potential energy in an object.

We are given that At 2.5 seconds, the helicopter has a kinetic energy of 20 J, Also we know that Energy per time is called the power and is the rate of energy, therefore in order to find the mechanical energy at that time, we will simply divide the values, thus:

Mechanical energy is given as:

Thus, the mechanical energy will be 8 joules per second.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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