O-LevelMathematicsAlgebra and graphs4024/11 · May/June 2010 · Q235 Marks
A stone is thrown vertically upwards from the ground so that its height above the ground after t seconds is (20t – 5t²) metres.
- (a)(i)Show that the values of t when the stone is 15 metres above the ground satisfy the equation t²-4t + 3 = 0.[1]
- (a)(ii)Find the values of t when the stone is 15 metres above the ground.[2]
- (b)Find the value of t when the stone hits the ground.[2]
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