Projectile motion A level Physics

Projectile motion is a special case of two dimensional motion with constant acceleration. Here, force due to gravity moderates linear motion of an object thrown at certain angle to the vertical direction. The resulting acceleration is a constant, which is always directed in vertically downward direction.
                                                         read the rest at http://cnx.org/content/m13837/latest/
Problems on Projectile motion can either start from the botom with an object thrown at a angle witha speed.or it can startfrom a height like a cliff with the object either thrown upward or horrizontally with an initial speed.Which ever the problem is about the following formulas can be used to tackle the questions..

Remember these formulas for doing problems on projectile motion:



The maximum Height that the particle has travelled = u2sin2o(theta)
                                                                       2g
 The time taken for the particle to  reach the ground again   = 2u sino
                                                                                       g
Range     = u2sin2o
                  g