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You need to be able to analyze a projectile motion as follows.
- a projectile has an initial horizontal velocity ucos@ and an initial vertical velocity usin@.
- the gravitational force acts ONLY downwards and there for affects only the vertical component of the velocity .
- this cause the vertical component to decrease to zero at maximum height since it upward motion is oppose by gravity .
- hence the projectile is force by the force of gravity to follow a curved path