Question 984192
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(a)Calculate the braking for 20 miles per hour and 70 miles per hour, how do your answers compare?
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For 20 mph:
{{{D=(1/9)x^2}}}
{{{D=(1/9)(20mph^2)}}}
{{{D=(1/9)(400)=44.44ft}}}
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For 70 mph:
{{{D=(1/9)(70mph)^2}}}
{{{D=(1/9)(4900)=544.44ft}}}
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(c) Use the calculator to solve part (b) numerically. Do your answers agree?
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{{{D=(1/9)(x^2)}}}
{{{9D=x^2}}}
{{{3sqrt(D)=x}}}
{{{3sqrt(25ft)=x}}}
{{{15mph=x}}}