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police can estimate the speed a car had been travelling by the length of the skid marks. one formula used for this purpose is V= -7+8.2√d
whare V is the speed. in kilometer per hour, and d is the length of the skid marks in metres, what is the speed of the car? to the nearest kilometer per hour if the length of skid mark is 150m.
 
asked Nov 21, 2014 in PRECALCULUS by anonymous

1 Answer

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The Speed of the car is v = -7 + 8.2√d where d is the length of the skid marks.

The Length of the skid marks = 150 m

v = -7 + 8.2√d

v = -7 + 8.2√150 = -7 + 8.2 * 12.24 = -7 + 100.4290

v = 93.4290

Round off to the nearest value v = 93

Speed of the car is 93 kmph.

answered Nov 21, 2014 by Lucy Mentor

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