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Q2.5: NCERT Physics - Part 1 MOTION IN A STRAIGHT LINE 2.5 Solution: A car moving along a straight highway with speed of 126 km h�1…
A car moving along a straight highway with speed of 126 km h�1 is brought to a stop within a distance of 200 m. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop?
Step-by-Step Verified Solution
**Answer:** Retardation = 3.06 m/s_, time to stop = 11.43 s.
**Step-by-Step Explanation:**
Initial speed u = 126 km/h = 126 _ (5/18) = 35 m/s. Final speed v = 0. Distance s = 200 m.
Using v_ - u_ = 2as: 0 - 35_ = 2a(200) _ a = -1225/400 = -3.0625 m/s_.
Using v = u + at: 0 = 35 - 3.0625t _ t = 35/3.0625 = 11.43 s. [citation:1][citation:11]
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