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The reaction time for an automobile driver is 0.7 sec. If the automobile can be decelerated at 5 m/s2 calculate the total distance travelled in coming to stop from an initial velocity of 8.33 m/s after a signal is observed.

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12.77 m
14.82 m
16.83 m
19.65 m

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detailed solution

Correct option is A

v = u + at
0 = 8.33 - 5 x tt = 8.33/5
displacement s=ut+u22a
Area =8.33×0.7+12×8.3325
= 12.77 m

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