CAPE Pure Mathematics Unit 1 · May/June 2011 · Paper 1 · Question Q44
A rod is heated and its length at time t seconds is given by L = 5t^2 + 100 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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