. If an object of mass 5kg, is released in gravity from height 10m find how much velocity it will gain ? (2=10) *


Solution
This an be solved by 2 methods
v2 = u2 + 2ghv2 = 0 +2×10×10v =102 m/sorP.E. at height 10 m  = mgh = 5×10×10 = 500Same P.E. will convert into K.E. at h = 0K.E. =12mv2 = 500v2 = 10005 = 200v= 10 2  m/s

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