The Formula $s = k \sqrt { d }$ Relates the Speed

question 30

Multiple Choice

The formula $s = k \sqrt { d }$ relates the speed $s$ (in mph) of a car and the distance $d$ of the skid when a driver hits the brakes. How far will a car skid if it is going 48 mph on dry pavement? On dry pavement, $k = 5.34$ .

• A)about 59 ft
• B)about 76 ft
• C)about 99 ft
• D)about 81 ft
• E)about 70 ft

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