cannon on a level plain is aimed at an angle α above the horizontal and a shell is fired with a muzzle velocity v0­ towards a vertical cliff a distance Raway. Then the height from the bottom at which the shell strikes the side walls of the cliff is


Correct option is


The time taken to move a horizontal distance R is  Therefore, the vertical distance moved in this time is given by






boy aims a gun at a target from a point, at a horizontal distance of 100 m. If the gun can impart a horizontal velocity of 500 ms-1 to the bullet, the height above the target where he must aim his gun, in order to hit it is (Takeg = 10 ms-2)