CAPE Pure Mathematics Unit 1 · May/June 2012 · Paper 1 · Question Q28
The vector \mathbf{u} has magnitude 4\sqrt{5} units and is parallel to the vector \mathbf{v} = \mathbf{i} - 2\mathbf{j}. A unit vector parallel to \mathbf{u} is
- (A)
\frac{\sqrt{5}}{20}(\mathbf{i} - 2\mathbf{j}) - (B)
\frac{4}{\sqrt{5}}(\mathbf{i} - 2\mathbf{j}) - (C)
\frac{1}{\sqrt{5}}(\mathbf{i} - 2\mathbf{j}) - (D)
4\sqrt{5}(\mathbf{i} - 2\mathbf{j})
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