Unformatted text preview: 9. The driver on a car traveling 100 km/h has a human reaction time of 1.0s in order to
. lly apply the brakes for an emergency stop on the highway. ' EgLWQ a. Calculate the stopping distance for a car with a = - 5.0 m/sz.
b. Calculate the stopping distance for a car with a = — 9.0 m/sz. m} L,
y: yon/0+ +vza+7~ v=vo+a+ ﬁt
Owe:- ’278mlS-t- (-5m132)f " it: Omts—Z‘i.‘am\s 2: 5.5M Stocrﬂﬁ
‘Bmt’a’zr ﬂ 1
y —, (2-7 .smps)t6.cstos)+ Vz\'5m§§1}(§»&a§ X: 155,; 77m 177‘ in '2 I 10. A speeding motorist passes a stopped police car. 2.0 s after. the moment he passes,
the police car begins accelerating at a constant rate of 4.4 m/sz. The motorist,
unaware that he is being chased, continues at constant speed until the police car catches him 14 3 later. How fast is the motorist going? ﬂ UATQ-
V: Votat \
\/ 3 O + WAN ﬁZMQ‘é) “mgwmmiﬁs
\/ : 5.2.‘Eaml 5 s2: ...
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- Fall '08