Answer:
The player's speed afterward ball is thrown at 18
relative to ground is 2.04

Step-by-step explanation:
Given:
Mass of football player
kg
Speed of player

Mass of football
kg
For finding the player's speed afterward the ball is thrown at 18
relative to the ground,
The initial momentum of football player and ball is,



The final momentum of the system is,

Here given in question


Using the conservation of momentum,




Therefore, the player's speed afterward ball is thrown at 18
relative to ground is 2.04
