How does inertia affect a person who is not wearing a seatbelt during a collision?

They are sent forward with force with a potential fatal consequence. 

They are sent forward, because of momentum (Inertia). 

Lnertia is the resistance of any object to a change in its state of motion. This means it is the tendency for an object to stay moving at a constant rate in a straight line. So if a car stops suddenly, as what happens in a collision, the unbelted passenger would continue at the same rate of speed forward until they met resistance in the form of the windshield or dashboard. Ouch!

Wear your seatbelt!!

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge