A ball is thrown vertically upwards from the ground and a student gazing out of the window sees ...

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A ball is thrown vertically upwards from the ground and a student gazing out of the window sees it moving upward past him at \( 10 \mathrm{~ms}^{-1} \). The window is at \( 15 \mathrm{~m} \) above the ground level. The velocity of ball \( 3 \mathrm{~s} \) after it was projected from the ground is [Take \( g=10 \mathrm{~ms}^{-2} \) ]
(a) \( 10 \mathrm{~m} / \mathrm{s} \), up
(b) \( 20 \mathrm{~ms}^{-1} \),up
(c) \( 20 \mathrm{~ms}^{-1} \), down
(d) \( 10 \mathrm{~ms}^{-1} \), down
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