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QUESTION 13
A stone of mass 3 kg is dropped into a water tank. The stone has negligible speed when entering the
water surface and takes 3 seconds to sink to the bottom. While sinking, the resistance of the water is 9N.
The acceleration of the stone and the height of water column are respectively :
O 1.6.81 ms-2, 30.64 m
O 2.9.81 ms-2, 44.1 m
O 3. (-) 9.81
ms-2, 44.1 m
O 4.12.81 ms 2, 57.6 m

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