Question

Problem - 3.14: A driver can stop his car from the red
signal at a distance of 20 m when he is driving at
36 kmph and 41.25 m when he is driving at 54 kmph.
Find his reaction time.​

Answer 1

Answer:

1.5 seconds

Explanation

Because reaction time here is the difference in the time taken to stop the vehicle. Case 1: u is 10m/s since v=0 u=at=10 applying this in 3rd equation of motion v^2-u^2=2as and substituting for a as t/10 we get t as 4 sec when the same is done for 2nd case we get t as 5.5 sec The absolute difference of both is 1.5sec

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