CAPE Pure Mathematics Unit 1 · May/June 2009 · Paper 1 · Question Q44
A rod is heated and its length at time t seconds is given by L = 5t^2 + 100\text{ centimetres}. When t = 3, the rate of increase of L, in \text{cm s}^{-1}, is
- (A)15
- (B)30
- (C)45
- (D)60
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