Question

how many times will the kinetic energy of a body increased if the it's speed is tripled show by calculation​

Answer 1

we know that

ke=1÷2×mv^2

and when speed become triple of original then new speed become 3v

then,new ke=1÷2×m(3v)^2

=1÷2×9mv^2

9×original ke

hence ke will increase by 9 times