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In Mechanical system, Total energy = Kinetic energy + Potential energy

other form of energy i.e.Heat energy dissipated due to friction,

Suppose a ba certain heightin height falls on the floor. At the highest point the all energy of the ball is purely potential energy.As this ball begins to fall down towards the floor then its energy transforms from potential energy to kinetic energy.

with which it strikes the floor ?

mgh = ½ mv

v = (2gh)

and this gives us,

v = 4.4 m/s

Example 2 A golf ball of mass 25 g is thrown upwards with a velocity 5 m/s. Calculate the height at

which it comes at rest ?

Solution energy of the ball at the lowest point is purely kinetic and this energy being completely transferred

into potential at highest point.

So, 1/2mv2 = mgh

h = v

h = 2.5 m