Question

Mass of a body doubles and velocity increases by three times then its kinetic energy

Answer 1

let initial mass be 'm'
and velocity be 'v'
so KE1=1/2mv^2

now mass become='2m'
velocity become='3v'
now KE2=1/2(2m)(3v)^2
KE2=9mv^2

so KE INCREASED BY 18 TIMES

Answer 2

mass of a bpdy doubles and velocity increased by three times then its kinetic energy increased 18 times