Question

please please answer this question

Answer 1

In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. 

for A, 125=(5/2)*velocity* velocity
. so velocity is √50.
for B, 9=(1/2)* velocity* velocity , so velocity is √18.

any doubts?
ratio of their velocities is (√50)/(√18)
= 7.07106781/ 4.24264069
= 1.66666667