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A kite is flying at a height of $150$ m from the ground. It is attached to a string inclined at an angle of $30^\circ$ to the horizontal. The length of the string is:
- (a)$100\sqrt{3}$ m
- (b)$300$ m
- (c)$150\sqrt{2}$ m
- (d)$150\sqrt{3}$ m
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(B) $300$ m