In order to treat horizontal and vertical dimensions of a projectile as separate, the assumption that is True is (d)initial x velocity is zero .
What is a Projectile ?
Projectile motion is defined as the motion of an object that is thrown (projected) into air. and After initial force that launches object, it only experiences force of gravity.
The object is called as a projectile, and the path is called as trajectory.
the condition to treat horizontal and vertical dimensions of a projectile as separate is that "we need to take the acceleration in x direction as 0 "
that means ; initial x velocity is zero .
Therefore , the correct option is (d).
The given question is incomplete , the complete question is
In order to treat the horizontal and vertical dimensions of a projectile as separate, which assumption must be true?
(a) initial y velocity is zero
(b) air resistance is negligible
(c) the projectile travels over level ground initial velocity is at a 45 degree angle
(d) initial x velocity is zero .
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