A \( 5 \mathrm{~kg} \) mass moving at a speed of \( 3 \mathrm{~ms}^{-1} \), collides head on wit...

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A \( 5 \mathrm{~kg} \) mass moving at a speed of \( 3 \mathrm{~ms}^{-1} \), collides head on with a body of mass \( 1 \mathrm{~kg} \) at rest, if they move with a common velocity after collision in the same direction, the velocity is
a. \( 25 \mathrm{~ms}^{-1} \)
b. \( 250 \mathrm{~ms}^{-1} \)
c. \( 2.5 \mathrm{~ms}^{-1} \)
d. \( 20 \mathrm{~ms}^{-1} \)
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