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TEA [102]
1 year ago
10

PLEASE HELP!!!!

Physics
2 answers:
Goryan [66]1 year ago
7 0

Answer:

The braking distance would be about nine times as long (assuming that acceleration during braking stays the same.)

Explanation:

Let u denote the initial velocity of the vehicle (20\; \text{mph} or 60\; \text{mph}) and let v denote the velocity of the vehicle after braking (0\; \text{mph}). Let x denote the braking distance.

Assume that the acceleration during braking are both constantly a in both scenarios. The SUVAT equations would apply. In particular:

\begin{aligned} x &= \frac{v^{2} - u^{2}}{2\, a}\end{aligned}.

Since v = 0<em> </em>(the vehicle has completely stopped), the equation becomes x = (-u^{2}) / (2\, a).

Assuming that a (braking acceleration) stays the same, the braking distance x would be proportional to u^{2}, the square of the initial velocity.

Hence, increasing the initial speed from 20\; \text{mph} to 60\; \text{mph} would increase the braking distance by a factor of 3^{2} = 9.

netineya [11]1 year ago
7 0

Answer:

9 times

Explanation:

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