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JEE Main 2021 — Laws of Motion Question with Solution

JEE Main 2021 (20 Jul Shift 1)

Question

The normal reaction N for a vehicle of 800 kg mass, negotiating a turn on a 30° banked road at maximum possible speed without skidding is ____ ×103 kg m s-2.

Choose an option

Show full solutionCorrect option: A
Correct answer
A10.2

Step-by-step explanation

At vmax, f will be limiting in nature.

∴ Balancing force in vertical direction, Ncos30°-mg-μNcos60°=0
⇒Ncos30°-μcos60°=mg
∴ N=800×10(0.87-0.1)≈10.2×103 kg m s-2
Hence, option 1.

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About this question

This is a previous-year question from JEE Main 2021, covering the Laws of Motion chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.