A compact car moving at 60 m/s has 320,000 J of kinetic energy. What is its mass?
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To solve this problem we will apply the concepts related to the electric field, linear charge density and electrostatic force.
The electric field is
Here,
= Linear charge density
= Permittivity of free space
r = Distance
The linear charge density can be written as,
Linear charge density is given as
Replacing,
The initial and final electric Force can be written as function of the charge and the electric field as
If we replace the value for the electric field we have,
Length is one third at the end, then
The ratio of the force is
Therefore the required ratio is 3