" An object<span> at rest stays at rest and </span>an object <span>in motion stays in motion with the same speed and in the same direction </span>unless acted upon<span> by an </span>unbalanced force<span>."- Newtons first Law of Motion
Also, velocity is the speed of something in a given direction (So, 50mph North is an example of velocity)</span>
Explanation:
static electricity draws energy
Answer:
Explanation:
First, the box goes from position x=0 to x=x1, so, the work made by the friction is calculated as:
where 
is the force of friction, 
the displacement, m the mass, V is the speed in rest and 
the initial speed.
V is equal to zero, so:
it means that the force of friction is equal to:
On the other hand, when the box goes from position x=x1 to x=x2, the work-energy theorem said that:
Where 
is the work done by the person.
Then, solving for :
Finally, replacing by 
, we get:
