Need some explaining ?? kinetic energy
Supposc o stationary object of muss m moves because of un upplied iOrce. Let u be its
the ond. time t, the velocity the becomes equal to v. The displucement
this tune is s, I-he work done on the object. W = F . s
According to Newton's second Of motion,
( I ) Similarly, using Newton 's second equation of motion
4 However. os initial velocity is zero. u = 0.
v = at
.. v: = at
W = ma x
at using equations (l) und (2)
Using Newton's first equation of motion —
at
mv: using equations (3) and (4)
Tile kiRetic energy gained by an object is the amount of work done on the object.
: A stone having a mass of 250 is falling from a height.•How much kineti
energy does hove at the moment when its velocity is 2 m/s?
2-sog
x 0.25 x = 0.5 J

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