Let mass of ball A be '2m' and mass of ball B be 'm' - - - -(given). Now, since KE=1∕2mv2 Therefore, KE of object A=1∕2(2m)(v)2 And KE of object B=1∕2(m)(v)2 Now, ratio of KE's of both objects, ⇒(KE of A)∕(KE of B) ⇒[1∕2(2m)(v)2]∕[1∕2(m)(v)2] ⇒2∕1 Therefore, ratio of KE of object A to ball B is 2: 1 (answer)