Please draw a schematic diagram. Show us the exact formula we want to use and ask for a detailed process

Jermaine is riding his skateboard around the playground when he "accidentally" bumps into his older brother, Tito, who is sitting motionless on a swing. Jermaine's mass is 35 kg and Tito's mass is 45 kg and Jermaine comes to rest because of the collision. If Tito swings up to a height of 0.50 m above his starting position because of the collision, how fast was Jermaine moving just before the collision