Question

Velocity of the body is increased 3 times then its kinetic energy increases by

Answer 1

kinetic energy will increase by 9 times as follows;

since we know that,
KE= 1/2mv²
on increasing velocity 3 times:
KE= 1/2m(3v)²
KE=1/2m × 9v²
above result can be written as:
KE=9[1/2mv²]
so from the above result it is clear that kinetic energy has been increased by 9 times