Answer:
Explanation:
Kinetic energy will be mg×( total height - x ) and potential energy will be 6 g x .
Let assume point B is located at height x unit from the surface,
As we know , potential energy = m g h ( where m = mass of the body , g = gravitational acceleration and h = height from the surface )
so potential energy at point A = 480 j or 6gh ( h = total height from surface )and for the point B it is , 6gx ( where g = 9.8 m/s²) .
At point A , total kinetic energy is 0 or, 1/2 mu² = 0
∵ u = 0,
So, initial velocity is zero ,
Now we will apply Newton's formula ,
and we will get , v² = u² + 2as
or, v² = 0 + 2 g h ( as acceleration = gravitational acceleration = g ; s = height h )
[ multiplying both side with 1/2 m ]
or , 1/2 m v² = m g h
Kinetic energy = 1/2 m v² = m g h
[ h = ( total height - x ) at point B . ]
Kinetic energy = m g ( total height - x )
To know more about potential energy ,
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