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

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:

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
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