1) 7.5 N
2) 10 N
Step-by-step explanation:
1)
We can solve this first part of the problem by using Newton's second law of motion, which states that the net force on an object is equal to the product between its mass and its acceleration:
where
F is the net force
m is the mass of the object
a is its acceleration
In this problem we have:
m = 1.5 kg is the mass of the ball
is the acceleration
So, the kick force on it was:
2)
In this case, the mass of the ball has increased to
m' = 2 kg
We can also solve this part by using again Newton's second law of motion:
where
F' is the new kick force
m' = 2 kg is the new mass of the ball
a is the acceleration
The acceleration is the same as before,
Therefore, the new kick force is: