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Suppose at P point, a body loses its entire K.E which it had at O point and at Q point body losses 1/3 of its K.E which is at has at O. Find out the height h.

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1 Answer

Use principle of conservation of energy
 
Total initial energy = Total final energy
Assuming O as reference of height measurement.
KE = 1/2mv^2            m is mass of the body and v is velocity of the body
PE = m x g x h            m is mass of the body, g is acceleration due to gravity, h is height above 
                                  reference point of height measurement (O)
 
Initail energy at O = initial kinetic energy (KE) + initial potential energy( PE)( = zero since h is zero)
Final energy at Q = 1/3 initial KE + mgh ( h is height above point O)
 
KE + 0 = 1/3(KE) + mgh
 
mgh = 2/3KE = 2/3 (1/2mv^2) = 1/3mv^2
h = 1/3 (v^2/g)       v is velocity at point O.