Constant Projectile Motion and Constant Velocity

Constant projectile motion is a type of motion where a projectile is launched into the air and moves along a parabolic path under the influence of gravity. During this motion, the velocity of the projectile changes, but the speed remains constant. There are two components of velocity in constant projectile motion, the horizontal and vertical components. The horizontal component remains constant throughout the motion, while the vertical component changes due to the acceleration of gravity.

Explanation of the Correct Answer

The correct answer is option 'C', which states that the horizontal component of the velocity is constant in constant projectile motion. This is because the motion of the projectile in the horizontal direction is not affected by gravity since there is no force acting in that direction. Therefore, the horizontal component of the velocity remains constant throughout the motion.

Explanation of the Incorrect Answers

Option 'A', which states that the resultant of the velocity of projection is constant, is incorrect because the resultant velocity of the projectile changes due to the acceleration of gravity in the vertical direction.

Option 'B', which states that the vertical component of the velocity is constant, is also incorrect because the vertical component of the velocity changes due to the acceleration of gravity.

Option 'D', which states that the velocity of projection is constant, is also incorrect because the velocity of projection is the initial velocity of the projectile, which is constant, but the velocity of the projectile changes during its motion.

Conclusion

In constant projectile motion, the horizontal component of the velocity remains constant, while the vertical component changes due to the acceleration of gravity. Therefore, option 'C' is the correct answer.