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anonymous

  • 5 years ago

The formula r=2sqrt(5L) can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 20 mph?

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  1. anonymous
    • 5 years ago
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    \[20 = 2 \sqrt{5L}\]\[10 = \sqrt {5L}\]\[10^{2} = 5L\]\[L = 100/5 = 20\]

  2. anonymous
    • 5 years ago
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    So how many feet is it? 100/5?

  3. anonymous
    • 5 years ago
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    transform 20 mi into feet 20 mi = 105 600 feet

  4. anonymous
    • 5 years ago
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    okay, what do i do next?

  5. anonymous
    • 5 years ago
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    that's yur answer..

  6. anonymous
    • 5 years ago
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    105 600 feet is my answer?

  7. anonymous
    • 5 years ago
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    a car that has left skid marks of length L, in feet. How far will a car skid at 20 mph? -> 20 mi = 105 600 feet

  8. anonymous
    • 5 years ago
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    Ok, thank you.

  9. anonymous
    • 5 years ago
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    np

  10. anonymous
    • 5 years ago
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    what about at 80mph

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