Question

if a man increases his speed by 2 metre per second his k.E is doubled the originals speed of the man is

Answer 1

let KE is 1/2mv^2.
He increases speed by 2m/s,so new speed will be (v+2)m/s.

So form the equation now,2×1/2mv^2=1/2m(v+2)^2.

Solve it and then cheers.

Thanks.
Tripathy