Answer
4
Explanation
The energy possessed by an object in motion is called kinetic energy.
Kinetic energy (K.E) = 1/2 mv²
Where m is the mass of the body and v is the velocity of the object.
For the vehicle traveling at 20 mph, its energy is;
K.E = 1/2×m×20² = 200m
For the vehicle moving at 10 mph, its energy is;
K.E = 1/2×m×10² = 50m
∴ 200m ÷ 50m = 4
It can be seen that the force of impact is 4 times greater.
I did not consider changing the units of velocity from mph to mps because am comparing the two energies. Even if I convert the velocities to mps, the answer would be same 4 times greater.
