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A ball's height is h = 20t - 5t² metres. When does it land?
A10 s
B4 s
C2 s
D5 s
Answer & Solution
Correct answer: B. 4 s
Setting 20t - 5t² = 0 gives 5t(4 - t) = 0, so it lands at t = 4 s.
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