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-- 7. A man is running with velocity 20 km/h towards west and rain is falling vertically down with 10 m/s. Direction of rain w.r.t. man is:
A
tan⁻¹(5/9) with vertical
B
tan⁻¹(9/5) with vertical
C
tan⁻¹(5/4) with vertical
D
tan⁻¹(2) with vertical
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-- 6. A particle moves in space along the path z = ax³ + by² in such a way that

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