A stone Q is tied to a point P vertically above Q by an inelastic string of length 2 meters. How high does the stone rise when the string is inclined at an angle 60
oto the vertical?
 

  • A It does not rise
  • B 2\(\sqrt{3}\) meters
  • C 3 meters
  • D 1 meters
  • E 3
jamb 1982mathematics

The correct answer is D. 1 meters

1. \(\cos(60^\circ) = \frac{PD}{2}\)

2. \(\cos(60^\circ) \times 2 = 0.5 \times 2\)

3. \(= 1 \, \text{m}\)

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