Given:
The mass of the bullet is m = 0.0555 kg
The height of the building is h = 12 m
The speed of the bullet is v = 600 m/s
To find the mechanical energy just after it fired.
Step-by-step explanation:
Mechanical energy is the sum of potential energy and kinetic energy.
The potential energy of the bullet can be calculated by the formula
Here, g = 9.8 m/s^2 is the acceleration due to gravity.
On substituting the values, the potential energy will be
The kinetic energy can be calculated as
Thus, the mechanical energy will be
Hence, the correct option is D