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Friday, 9 October

NEET UG 2025 · Physics · Question 7

NEET 2025 Physics, question 7

Question 7 of the NEET 2025 paper (code 45) is a Physics question from Work, Energy and Power. Its idea, Trajectory After String Goes Slack, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.

Updated 2026-10-08

Q7 · Physics

A bob of heavy mass mm is suspended by a light string of length ll. The bob is given a horizontal velocity v0v_0 as shown in figure. If the string gets slack at some point PP making an angle θ\theta from the horizontal, the ratio of the speed vv of the bob at point PP to its initial speed v0v_0 is:

The figure, described in words

Vertical circle of radius l about O; bob m at bottom given horizontal velocity v0; point P on upper part at angle theta above horizontal through O.

  1. 1(sin⁡θ)1/2(\sin\theta)^{1/2}
  2. 2(12+3sin⁡θ)1/2\left(\frac{1}{2+3\sin\theta}\right)^{1/2}
  3. 3(cos⁡θ2+3sin⁡θ)1/2\left(\frac{\cos\theta}{2+3\sin\theta}\right)^{1/2}
  4. 4(sin⁡θ2+3sin⁡θ)1/2\left(\frac{\sin\theta}{2+3\sin\theta}\right)^{1/2}Official answer

Official answer: option 4 · NTA final answer key

Same idea

The only question on Trajectory After String Goes Slack

No other NEET paper from 2017–2026 tested this exact idea.

Trajectory After String Goes Slack: every question and how it was framed

The chapter

Work, Energy and Power in ten years of NEET

16 questions from 2017–2026, asked in 9 of 10 papers, about 1.5 a paper. Work-Energy Theorem alone had 12.

Chapter analysisStudy this chapterPractise this chapter

Work, Energy and Power: questions per paper

0241’172’182’190’202’212’221’232’242’252’26