1) The velocity after 2 hours is 64 km/h
2) The force exerted on the ball is 2.1 N
Explanation:
1)
The motion of the car is a uniformly accelerated motion (= constant acceleration), so we can solve the problem with the following suvat equation:
where
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time
In this problem:
u = 0 (the car starts from rest)
is the acceleration
t = 2 h is the time
Substituting, we find the velocity after 2 hours:
2)
To solve this part, we can use Newton's second law, which states that the net force exerted on an object is equal to the product between the mass of the object and its acceleration:
where
F is the net force
m is the mass of the object
a is its acceleration
For the ball in this problem:
m = 700 g = 0.7 kg is its mass
is its acceleration
Therefore, the force exerted on the ball is
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