Year 12 Specialist (Unit 3 & 4)
Vector calculus
Projectile motion
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Question 1
196279
A ball is kicked from level ground with speed \(20\ \text{m/s}\) at \(30^\circ\) above the horizontal. Let \(\mathbf{i}\) be horizontal and \(\mathbf{j}\) vertically up. Which is its initial velocity vector?
\(10\sqrt{3}\mathbf{i}+10\mathbf{j}\)
\(10\mathbf{i}+10\sqrt{3}\mathbf{j}\)
\(20\mathbf{i}+10\mathbf{j}\)
\(10\sqrt{3}\mathbf{i}-10\mathbf{j}\)
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