C.energy
The law of conservation of energy says that energy can neither be created nor destroyed.
Velocity is speed plus the direction of the speed.
The wall exerts a force of equal magnitude but in the opposite direction. So the force by the wall is 10 N to the right.
The answer to question one is A.
The answer to question two is A.
The answer to question three is D.
To solve this problem we will use the kinematic formula for the final velocity.

The final speed is 0 at the moment the player stops.
The time until it stops is 1.3 s
The initial speed is 200 feet / s Note (check the speed units in the problem statement, 200ft / s is very much and 200ft / h is very small)
Then, we clear the formula.

Because the player is slowing down, the acceleration goes in the opposite direction to the player's movement, and that is why it is negative.
To answer part b) we use the following formula.
