1) The identity is true
2) The child has a greater momentum than the bike.
3) The total momentum of a closed system remains constant throught time, regardless of changes within the system
Explanation:
1)
We need to rewrite the Newton, which is the unit of the force (F). Using Newton's second law:
So, (left side) is equal to
So, the identity is true.
2)
The momentum of an object is given by:
where
m is the mass of the object
v is its velocity
Here we have:
M = 23 kg is the mass of the child
v = 4.5 m/s is the velocity of the child
So its momentum is
The bike has
m = 5.5 kg is its mass
v = 4.5 m/s is its velocity
So, its momentum is
So, the child has a greater momentum than the bike.
3)
A closed system is a system on which the next external force acting on it is zero:
From Newton's second law, we know that the net force acting on a system is equal to the rate of change of momentum of the system:
where
is the change in total momentum of the system
is the time interval
For a closed system, this implies that
which means that the total momentum is constant.
Learn more about momentum and Newton's laws here:
brainly.com/question/7973509
brainly.com/question/6573742
brainly.com/question/2370982
brainly.com/question/9484203
brainly.com/question/3820012
#LearnwithBrainly