Projectile motion is an example of motion in a plane with ____ acceleration.

Concept:

Projectile Motion:

•  It is referred to the motion of any object, thrown at an angle from horizontal.  The object is under influence of acceleration due to gravity. 
• Projectile Motion is an example of a 2-dimensional Motion. 

• The body reaches its maximum height when its velocity along the vertical direction becomes zero. 
  • It is simply like throwing a ball vertically upward and at maximum height, its velocity becomes zero and it starts to fall back. 
• But, the horizontal speed given to the ball will remain the case. 
• We can analyze the projectile motion in two dimensions. 

Motion in Two-dimension

• Along the X-axis or horizontal axis
  • The initial speed is ux = u cos θ 
  • Acceleration ax = 0
• Along the Y- Axis or Vertical axis,
  • The initial speed is Uy = u sin θ 
  • Acceleration here is the acceleration due to gravity in the downward direction or negative Y direction.
  • Acceleration ay = - g

Explanation:

• Here, we can see the acceleration is zero in the horizontal direction and it is g in the vertical direction. 
• g is constant throughout the projectile motion. 
• Hence, the acceleration is constant. 

So the correct option is 'Constant.'