A car was moving at 90km/h. on seeing a baby 20m ahead on the road, the driver jammed on the brakes and it came to rest at a distance of 15m.what is it's retardation and how long does it take to come at rest?
Answers
Answered by
2
Answer:
3/5 m/sec
Explanation:
it may be right
put it BRAINLIEST ANSWER
Answered by
5
Answer:
The Time taken is 4.32 seconds.
Explanation:
Initial Velocity (u) = 90 km/hr
= (90*5/18) m/s
= 25 m/s
S = 15 m
Final Velocity (v) = 0 m/s
Let the retardation be a.
According to the formula,
= v² = u²-2aS
= 0² = 25² - 2[15a]
= 0 = 625 - 30a
= 30a = 625
= a = 20.83 m/s²
Time = Retardation = (u-v)/t
= 20.83 = 90/t
= 20.83t = 90
= t = 4.32 s
Hope this helps.
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