A student placed a pencil in a cup of water. The pencil appears broken because light- always travels in a straight line makes th
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For the work-energy theorem, the work done by the engine on the car is equal to the variation of kinetic energy of the car:
where m=1167 kg is the mass of the car,
is the initial speed and 
is the final speed.
Putting numbers into the equation, we find:
where m=1167 kg is the mass of the car,
Putting numbers into the equation, we find:
The question is missing, however, I guess the problem is asking for the value of the force acting between the two balls.
The Coulomb force between the two balls is:
where
is the Coulomb's constant, 
is the intensity of the two charges, and 
is the distance between them.
Substituting these numbers into the equation, we get
The force is repulsive, because the charges have same sign and so they repel each other.
The Coulomb force between the two balls is:
where
Substituting these numbers into the equation, we get
The force is repulsive, because the charges have same sign and so they repel each other.