JEE Main Physics 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, the final velocity of the combined mass is [Kerala CEE 2006]

• (A)6 ms⁻¹
• (B)5 ms⁻¹
• (C)3.6 ms⁻¹
• (D)2.4 ms⁻¹Correct