Question

the kinetic energy of a body is K if one fourth of its mass is removed and velocity is doubled it's new kinetic energy is

Answer 1

K=mv^2/2
now 
new mass=m-1/4m=3/4m
velocity= 2v

new k=3/4m(2v)^2/2
         =3 mv^2/2
         =3K
kinetic energy gets tripled

Answer 2

Answer:

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