a particle is projected from a point at a height 3h metres above a horizontal
play ground. the direction of the projectile makes an angle α with the
horizontal through the point of projection. show that if th greatest
height reached above the point lc projection is h metres, then the horizontal
distance travelled by the particle before striking the plane is 6h cotα metres.
Find the vertical and horizontal component of the speed of the particle just
before it hits the ground.
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