A block of mass 10kg is kept on an inclined plane of inclination 30∘ . If the inclined plane is moving upwards with acceleration of 2ms-2 and the block does not slide on the plane, work done by gravity in 3 seconds is (g=9.8ms−2)

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-441J

441J

-882J

882J

answer is C.

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Detailed Solution

W=FS CosθW=mg×(ut+12at2)×cos 180W=10×9.8×12×2×9×(-1)W=-882J

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