A block of mass \( 5 \mathrm{~kg} \) is raised from the bottom of the lake to a height of \( 3 \...

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A block of mass \( 5 \mathrm{~kg} \) is raised from the bottom of the lake to a height of \( 3 \mathrm{~m} \) without change in kinetic energy at any instant. If the density of the block is \( 3000 \mathrm{~kg} \mathrm{~m}^{-3} \), then the work done by the external force is equal to
(a) \( 100 \mathrm{~J} \)
(b) \( 150 \mathrm{~J} \)
(c) \( 50 \mathrm{~J} \)
(d) \( 75 \mathrm{~J} \)
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