Question

A cyclist double his speed. How will his kinetic energy change : Increase,decrease or remain same. Give reason

Answer 1

Increase because kinetic energy means In motion

Answer 2

let 1/2 mv² = K

When we increase speed to 2v 

1/2 x m x 2v x 2 v 

2mv² = 1/2 mv² + 1/2mv² = k + k = 2k 

So the kinetic energy got increased (doubled)