- please provide correct solutions only- If unsure, please do not answer as this leads to a lot of confusion

A red billard bail moves across a pool table at 4.0 m/'s and makes a head-on elastic collision with a blue ball of equal mass that is initially at rest, as shown in the diagram. The speed of the red ball after the colision is equal to 4 m/s /1 mark O a. 4.0 m/'s O b. 3.0 my/'s O c 20 m/s O d. 1.0 m/5 O e zero