Answer:
4times
Explanation:
The right-hand side of the equation [tex]\frac{v^{2} }{b}[/tex] computes braking distance by applying a braking coefficient factor (b) to the square of the car's velocity.
the brake coefficient is 170 and the velocity of the car is V.
At 20mph = 20^2 divides 170 = 2.3594
At 40mph = 40^2 divides 170 = 9.4117
Hence it is 4 times greater of 20mph
