1.

An object of mass m and velocity u has kinetic energy 200 J. Find the new kinetic energithe mass of the object becomes double and velocity still remáins the same?

Answer»

Let the k.e. in first case be xx = 1/2*m*v^2=200jin second caselet the kinetic energy be x'v'=vm'=2mx'= 1/2*2m*v^2x'= 2(1/2*m*v^2)x'=2(x)x'=2*200jx'=400j



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