kinetik energy

 
If you throw a small stone towards the future, it rocks
will be separated from your hand with a certain speed. stone
you throw a certain speed has energy, and
stones can make an effort to hit the target
front. The energy possessed by a stone because of its speed
is called kinetic energy.
Kinetic energy is the energy possessed by an object
because the object is moving, or in other words the object
have the speed. If we review the body of mass m moving
with velocity v, then the object is said to have
speed by:
KE = 1/2 m power of 2
So the kinetic energy is proportional to the mass of the object m and
proportional to the square of the velocity. If the masses become
twice the kinetic energy becomes twice as well, and if
speed is increased to twice the kinetic energy
will increase to four times the kinetic energy.
Example question:
1. A car of mass 500 kg is moving with
speed of 25 m / s. Determine: (a) the car's kinetic energy
pace, (b) what happens when the car suddenly
brakes.