Falling distance and magnet force

Falling distance and magnet force

Secondary 2
TGM Original Questions
  1. The distance \(d\) metres of an object above the ground varies directly with \((t-18)^2\), where \(t\) is seconds. Given \(d=45\) at \(t=3\), find
    1. the formula connecting \(d,t\), and
    2. when it reaches the ground.
  2. A magnet force is inversely proportional to the square of distance. It is \(18\) N at one distance. Find it when the distance is tripled.

Solution:

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Answer:(a)(i) \(d=\frac15(t-18)^2\); (ii) \(18\) s; (b) \(2\) N.

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