JAMB - Mathematics (1982 - No. 22)
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 60o to the vertical?
It does not rise
2\(\sqrt{3}\) meters
3 meters
1 meters
3
解释
Cos 60o = \(\frac{PD}{2}\)
Cos 60o x 2 = 0.5 x 2
= 1m
Cos 60o x 2 = 0.5 x 2
= 1m