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A block of mass 2 kg rests on a horizontal surface. The block is raised by 10 m by applying a vertically upward force 30N. The kinetic energy gained by the block is

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120 J

80 J

110 J

100 J

answer is D.

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Detailed Solution

Net vertically upward force $F = (30 - 2 \times 10) N = 10 N$

By work - energy theorem, $\frac{1}{2} m V^{2} = W_{n e t} = 10 \times 10 J = 100 J$

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