Question: A 20 kg ball moving with a velocity 6 ms−1 collides with a 30 kg ball initially at rest .if both of them coalesce ,then final velocity of the combined mass is
(A) 6ms^{-1}
(B) 6ms^{-1}
(C) 3.6ms^{-1}
(D) 2.4ms^{-1}
Answer: Option (D)
Solution:
