Two masses of 0.25 𝑘𝑔 each moves towards each other with speed 3𝑚𝑠−1 and 1𝑚𝑠 −1 collide and stick together. Find the final velocity

Question: Two masses of 0.25 𝑘𝑔 each moves towards each other with speed 3𝑚𝑠−1 and 1𝑚𝑠 −1 collide and stick together. Find the final velocity

(A) $0.5ms^{-1}$

(B) $2ms^{-1}$

(C) $1ms^{-1}$

(D) $0.25ms^{-1}$