A block of mass \( 2 \mathrm{~kg} \) is placed on a wedge fixed to a truck moving with velocity ....

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A block of mass \( 2 \mathrm{~kg} \) is placed on a wedge fixed to a
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truck moving with velocity \( 4 \mathrm{~ms}^{-1} \), as shown in the figure. If the block is at rest with respect to the truck, then the net work done in \( 2 s \) :
(1) \( 0 \mathrm{~J} \)
(2) \( 10 \mathrm{~J} \)
(3) \( 76.8 \mathrm{~J} \)
(4) \( 153.6 \mathrm{~J} \)


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