# To anticipate the dip and hump in the road the driver

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7. [9] To anticipate the dip and hump in the road, the driver of a car applies the brakes to produce a uniform decrease in speed before Point A and maintains this deceleration past Point The speed ofthe car is 25 mls at the bottom A of the dip and 13 mls at the top C of which is 120 m along the road from A. If the car has a net (resultant) acceleration of 3 mlspoint A and the radius of curvature of the hump at Cis 150 m, determine: cGO III GOm 'J ', ."." B 150mC. the hump, 2 at A 1 a) the rate of decrease of speed from Point A to Point C; ~ U-'1-=" LJ;> 1--1-2.Gc. (S-<;'o) a ==-cc--== eonsk n k ==; 13 'L =: 1 51--~2c Co-(120') CaL = -].CrD Wlkj CD b) the radius of curvature at Point A; c) the magnitude of the acceleration at the point of inflection B; 1-~R-t 6) j 1/ :;:;. 0 --::3 f==-t'xo 0/1 ::: .1L-00 e @o M(s:j0:::Q:= O-h " r d) the magnitude of the acceleration at point C. _1/ °D r..../5J....a 'l--= a () '1-1""" C -t. "L C ~ -:::' ) LJ'L ISL (1", ~ e:::: ISO 2, 2\2.204 -""S'--r,