If air resistance is ignored, then the horizontal component of acceleration is zero, becausethe only force on the bullet is gravitational, which has no horizontal component.
-- horizontal component of velocity -- horizontal component of acceleration (zero) -- vertical component of acceleration (g)
The horizontal acceleration i.e. Vx throughout the trajectory remains constant only of the air resistance is neglected. The gravity can affect the y-component of velocity but is unable to affect its x-component. Acceleration (delta V) does not occur unless a change comes into play per Newton. Gravity does not effect x but air resistance would. Likewise, projectiles launched from e.g. an explosion experience a reducing delta V in that acceleration from an explosion is subject to the inverse square rule.
No. They're independent.
A projectile's path is the result of the nature of its velocity, which has a constant horizontal component but an accelerated vertical component. The resultant path, in the absence of air resistance, is a parabola.
Yes, in the absence of air resistance, which is the way the situation is always viewed by everyone except Navy gunners.
the horizontal component remain unchanged because there in no acceleration in horizontal direction
Neglecting air resistance, the components of acceleration of an object that's dropped, tossed, pitched, flung, lobbed, heaved, launched, or shot are constant. The horizontal component is zero. The vertical component is 9.8 meters per second2, directed downward. These are both constant throughout the object's trajectory.
Divide the motion into a horizontal and a vertical component. The horizontal component won't be affected by gravity. The vertical component will get a downward acceleration of 9.8 meters per second per second.
A projectile will travel on a straight line unless external forces act upon it. Gravity will pull the projectile downward, i.e. affect its vertical velocity component. This is why the projectile will decelerate upwards, reach a maximum elevation, and accelerate back down to earth. The force vector of air resistance points in the opposite direction of motion, slowing the projectile down. For example, If the projectile is going forward and up, air resistance is pushing it backwards (horizontal component) and down (vertical component). Without air resistance, there is no external force acting upon the horizontal velocity component and the projectiles ground speed will stay constant as it gains altitude and falls back down to earth.
Yes. In fact, that's a quite common situation when something drops out of an airplane, for example - assuming air resistance can be neglected. In this case, the horizontal component doesn't change (there is no force that pulls the object sideways), but the vertical component does change (since gravity pulls the object downwards).
Because gravity is acting on the vertical component, exerting a constant -9.8m/s2 worth of acceleration.