a truck driver travelling at 36 km/h sees the traffic light turn red at the intersection. if his reaction time is 0.6s and the truck retards at 6m/s²,then distance travelled by truck before stopping is
a. 8.33m
b. 16m
c. 10.22m
d. 14.33m
Please answer fast
Answers
Given : A truck driver travelling at 36 km/h sees the traffic light turn red at the intersection
his reaction time is 0.6 s and truck retards at 6 m/s²
To Find : distance travelled by truck before stopping
a. 8.33m
b. 16m
c. 10.22m
d. 14.33m
Solution:
Initial velocity = 36 km/hr
= 36 x 5/18 = 10 m/s
Distance covered before applying brake = 10 x 0.6 = 6 m
V² - U² = 2aS
U = 10 m/s
V = 0 ( stop)
a = - 6 m/s² ( retardation)
=> 0² - 10² = 2(-6) S
=>-100 = -12S
=> S = 100/12
=> S = 25/3
=> S = 8.33 m
Total Distance covered = 6 + 8.33 = 14.33 m
option d is correct.
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