A projectile fired from a planet with a speed of `2ms^(-1)` traces the same trajectory as the projectile fired from the earth at a speed of `4ms^(-1)` .The acceleration due to gravity on the planet is?

a projectile is fired from the surface of the earth with a velocity of 5ms^(-1) and angle theta with the horizontal. Another projectile fired from another planet with a velocity of 3ms^(-1) 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 in ms^(-2) is given (g=9.8 ms^(-2))

Two planets are of the same material but their radii are in the ratio 2:1 . Then ratio of accelerations due to gravity on those two planets is

If the density of the planet is double that of the earth and the radius 1.5 times that of the earth, the acceleration due to gravity on the planet is

The mass of a planet is twice the mass of earth and diameter of the planet is thrie the diameter of the earth, then the acceleration due to gravity on the planet's surface is

The masses of two planets are in the ratio 1 : 2 . Their radii are in the ratio 1 : 2 . The acceleration due to gravity on the planets are in the ratio

Two projectiles, one fired from 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 idential trajectories. The value of acceleration due to the gravity on the planet is

The maximum horizontal range of projectile on the earth is R . Then for the same velocity of projection, its maximum range on another planet is (5R)/4 . Then, ratio of acceleration due to gravity on that planet and on the earth is

A projectile is thrown horizontally with a speed of 20ms^(-1) .If g is (10ms^(-2)) ,then the speed of the projectile after 5 second will be nearly