Square root word problem

D

Dhammit

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Nov 13, 2012
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The formula s=square root 18d can be used to find the speed s of a car in miles per hour when the car needs d feet to come to a complete stop after slamming on the brakes. If it took a car 12 feet to come to a complete stop after slamming on the brakes, estimate the speed of the car.
 
Dhammit said:
The formula s=square root 18d can be used to find the speed s of a car in miles per hour when the car needs d feet to come to a complete stop after slamming on the brakes. If it took a car 12 feet to come to a complete stop after slamming on the brakes, estimate the speed of the car.
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Is it under "constant" deceleration?

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Dhammit said:
The formula

s = square root 18d can be used to find the speed s

when the car needs d feet to come to a complete stop

took a car 12 feet

estimate the speed
Click to expand...

Hi D:

What is the difficulty? Is this your first exposure to letters of the alphabet representing Real numbers? What has your class been doing, lately?

\(\displaystyle s = \sqrt{18d}\)

This is a formula for s in terms of d. In other words, if you have a value for the number d, then this formula tells you how to determine the number s.

They want you to determine the number s when d is 12, using the given formula.

Substitute the number 12 for the symbol d, and then use a scientific calculator to finish. (Round your value for s to one decimal place, and report it with the given units: mph.)

Questions? Work to show? :cool:
 
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mmm4444bot said:
Not sure how they drive in India, but slamming on the brakes in the USA means constant deceleration! :p
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Not necessarily, in any country. If you press the brake peddle down as hard as you can, the action of the brakes might still depend on the speed of the car at a given instant.
 
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