A block of mass \( 1 \mathrm{~kg} \) moving with a speed of \( 4 \mathrm{~ms}^{-1} \), collides ...

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A block of mass \( 1 \mathrm{~kg} \) moving with a speed of \( 4 \mathrm{~ms}^{-1} \), collides with another block of mass \( 2 \mathrm{~kg} \) which is at rest. The lighter block comes to rest after collision. The loss in the K.E of the system.
a. \( 8 \mathrm{~J} \)
b. \( 4 \times 10^{-7} \mathrm{~J} \)
c. \( 4 \mathrm{~J} \)
d. \( 0 \mathrm{~J} \)
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