A projectile is fired from the surface of the earth with a velocity of $5\,\text{m/s}$ and angle $\theta$ with the horizontal. Another projectile fired from another planet with a velocity of $3\,\text{m/s}$ at the same angle follows a trajectory which is identical with the trajectory of the projectile fired from the earth. The value of the acceleration due to gravity on the planet is: (given $g = 9.8\,\text{m/s}^2$)