First slide
Projection Under uniform Acceleration

A projectile is fired from the surface of the earth with a velocity of 5 ms-1and angle θ  with the horizontal. Another projectile fired from another planet with a velocity of 3 ms-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 (ms-2) is (Given  g = ms-2


The equation of trajectory is 


where θ is the angle of projection and u is the velocity with which projectile is projected. For equal trajectories for same angles of projection,  

gu2= constant 

As per question 9.852=g32

where g' is acceleration due to the gravity on the planet. 


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