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True: The mechanical energy is the sum of the kinetic energy and the potential energy of a body
Explanation:
The mechanical energy of a body is the sum of its kinetic energy and its potential energy:
E = K + U
where
K is the kinetic energy
U is the potential energy
The kinetic energy of a body is the energy possessed by a body due to its motion, and it is given by
where
m is the mass of the body
v is its speed
The potential energy of a body can have different forms; the most common one is the gravitational potential energy (GPE), which is the energy possessed by a body due to its position in a gravitational field. Near the Earth's surface, it can be calculated as
where
m is the mass of the body
g is the acceleration of gravity
h is the height of the object above the ground
When there are no frictional forces acting on a system, the total mechanical energy of a body is conserved. An example of this is a body in free fall: as the body falls down, the gravitational potential energy is converted into kinetic energy (because the height h decreases, while the speed v increases), however the total mechanical energy, E, remains constant.
Learn more about kinetic energy and potential energy:
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Answer:
0.25223 seconds.
Explanation:
= Mass of bullet = 0.0146 kg
= Mass of block = 2.55 kg
v = Combined velocity
= Velocity of bullet = 816 m/s
g = Acceleration due to gravity = 9.81 m/s²
As linear momentum is conserved
Now as the block (with the bullet in it) reverses direction and rises,
Equation of motion
The time t is 0.25223 seconds.