Kinetic energy (1/2) m v^2 for a point mass) can be lost lots of ways.
For example it can be converted to potential energy by climbing a hill of height h in which case the decrease in KE is m g h
Or it can be converted o potential energy by compressing a spring in which case the decrease in KE is (1/2) k x^2
or it can be used up fighting friction on which case the decrease in KE is the friction force times the distance (the work done against friction).
That is just for starters.
what is the formula for finding the decrease in kenetic energy
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