A stone projected at an angle of `60^@` from the ground level strikes at an angle of `30^@` on the roof of a building of height `h`. Then the speed of projection of the stone is:

A stone is thrown horizontally from the top of a cliff and strikes the ground after 5 seconds, at an angle of 45^(@) with the horizontal . Calculate (i) height of the cliff. (ii) speed of projection of the stone .

A particle at a height h from the ground is projected with an angle 30^@ from the horizontal, it strikes the ground making angle 45^@ with horizontal. It is again projected from the same point with the same speed but with an angle of 60^@ with horizontal. Find the angle it makes with the horizontal when it strikes the ground

A stone is thrown from the top of a tower at an angle of 30^(@) above the horizontal level with a velocity of 40 m/s. it strikes the ground after 5 second from the time of projection then the height of the tower is

A stone is thrown from the top of a tower at an angle of 30^(@) above the horizontal level with a velocity of 40 m/s. it strikes the ground after 5 second from the time of projection then the height of the tower is

A projectile shot at angles of 45^(@) above the horizontal strikes a building 30 m away at a point 15 m above the point of projection. Find : (a) the speed of projection . (b) the magnitude and direction of velocity of projectile when it strikes the building .

A stone projected at angle theta with horizontal from the roof of a tall building falls on the ground after three seconds. Two second after the projection it was again at the level of projection. Then the height of the building

A stone projected at angle 'theta' with horizontal from the roof of a tall building talls on the ground after three second. Two second after the projection it was again at the level of projection. Then the height of the building is -

A stone projected at angle theta with horizontal from the roof of a tall building falls on the ground after three seconds. Two second after the projection it was again at the level of projection. Then the height of the building