What is Kinetic energy?Derive an expression for the Kinetic energy of a body of a
body of mass m moving with a velocity V. An object of mass 8 kg moves with a
velocity of 5 m/s. Calculate its kinetic energy.
Answers
The kinetic literally means motion. KE=12mv2; Here: m is mass of the partial or system and v is the speed. Derivation of the formula: Figure shows a particle of mass m under an external force F, which causes acceleration a in the particle.
Hope it helps ❤️ you
Answer:
Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has kinetic energy. ... This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed.
Consider a body of mass ‘m’ at rest. Let a constant force F act on the body producing an
acceleration ‘a’ for a distance ‘s’. Let the velocity of the body be changed to v.
In this case, initial velocity =0.
Final velocity =v.
Using, v
2
=u
2
+2as
v
2
=0+2as
v
2
=2as
s=
2a
v
2
Work done F∗s
=mas=ma
2a
v
2
Work done =
2
1
mv
2
By definition this work done is equal to the kinetic energy.
∴ kinetic energy of the body, E
k
=
2
1
mv
2
.