Question

At sixty miles per hour the force of your car is about four times as great as thirtymiles per hour?

Answer 1

here is your answer

No.

IF

both objects have the same mass, then the faster one has twice the momentum

and four times the kinetic energy of the slower one. If their masses are different, then

nothing can be calculated until we know the masses.


This is pretty basic physics:
We know the following formulae

F=maF=ma

a=v2f−v2i2Δda=vf2−vi22Δd

In both cases, the final velocity is 00. Assuming you have the same room, ΔdΔd, to decelerate in a crash,

F=mv22ΔdF=mv22Δd

Due to the square of the velocity, if you increase the impact speed by a factor of 2, you increase the impact force by a factor of 4.


hope you understand


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Answer 2

If both of the objects have the momentum of the motion them at the rate of 60 miles per hour the car force is about four times as great as 30 miles per hour.

It depends upon the final velocity of the kinetic energy.