A car starts from rest and accelerates uniformly at 2 m/s² for 10 s. Distance covered in 10th second is MCQ with Answer and Explanation

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A car starts from rest and accelerates uniformly at 2 m/s² for 10 s. Distance covered in 10th second is

A. 19 m

B. 20 m

C. 10 m

D. 2 m

Answer: Option A

Solution (By JKSSB Mock Tests)

s_nth = u + (a/2)(2n-1) = 0 + (2/2)(20-1) = 19 m.

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A spring stores 18 J energy when stretched 3 cm. Force constant k is:

A. 2 N/m

B. 6 N/m

C. 200 N/m

D. 40000 N/m

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Correct Answer: Option D

Explanation:
Elastic PE: U = ½kx² ⇒ k = 2U/x². x = 3 cm = 0.03 m. k = 2×18/(0.03)² = 36/0.0009 = 40000 N/m. Unit conversion critical: cm to m. Memory aid: 'k = 2U/x²; always use SI units'. Tests spring energy formula application with unit conversion, frequently appearing in competitive exams.

This question belongs to: Science Physics