Police use the formula:

v = sqrt(20 L)

to estimate the speed of a car, v, in miles per hour, based on the length, L, in feet, of its skid marks when suddenly braking on a dry, asphalt road. At the scene of an accident, a police officer measures a car's skid marks to be 188 feet long. Approximately how fast was the car traveling? Round your answer to the nearest tenth (one decimal place) of a unit.

Question

Police use the formula:

v = sqrt(20 L)

to estimate the speed of a car, v, in miles per hour, based on the length, L, in feet, of its skid marks when suddenly braking on a dry, asphalt road. At the scene of an accident, a police officer measures a car's skid marks to be 188 feet long. Approximately how fast was the car traveling? Round your answer to the nearest tenth (one decimal place) of a unit.

sweetburger · Answer

Police use the formula gg

anonymous · Answer

@jim_thompson5910

triciaal · Answer

v = sq rt (20 * 188)
v = sq rt (4*5*4* 47)
 = 4 rt5*rt47
estimated v = 4*2*7= 56  actual = sq rt 3760 then round to 1 decimal

anonymous · Answer

That was it.  Can you explain how you got to the answer?

anonymous · Answer

@triciaal

anonymous · Answer

They wanted the actual answer with 1 decimal place

triciaal · Answer

i did
look at the given formula
replace l with 188 and solve

triciaal · Answer

did you get it or do you need more help?

anonymous · Answer

I got it.  thanks :)