Two projectiles, one fired from surface of earth with velocity $10 \,m/s$ and other fired  from the surface of another planet with initial speed $5\, m/s$ trace identical trajectories.  The value of acceleration due to the gravity on the planet is   ......... $m/s^2$

  • A

    $2.5 $

  • B

    $3.6$

  • C

    $4.9 $

  • D

    $6.4 $

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