A car is moving at 40 mi/h along a straight line when the driver sees a light turn red. She hits the brakes when she is 100 ft from the light and decelerates at the rate of 16 ft per second squared. How far does she travel before stopping? Choose the whole number that is closest to the correct answer.

Question

A car is moving at 40 mi/h along a straight line when the driver sees a light turn red. She hits the brakes when she is 100 ft from the light and decelerates at the rate of 16 ft per second squared. How far does she travel before stopping? Choose the whole number that is closest to the correct answer.
Hint: First convert 40 mi/hr into ft/sec. 
Hint: See the Equations of Motion

bobpursley · Answer

do the first hint. Vf^2=vi^2 + 2 ad solve for a.

Anonymous · Answer

25