Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

A ball is thrown upwards and it returns to the ground describing a parabolic path. Which of the following remains constant?

Kinetic energy of the ball

Speed of the ball

Horizontal component of velocity

Vertical component of velocity

Force Analysis: In projectile motion (neglecting air resistance), the only force acting on the body is the force of gravity, which acts vertically downwards. There is no force acting in the horizontal direction .
Acceleration: Since force is zero in the horizontal direction, the horizontal acceleration ( $a_x$ ) is zero. In the vertical direction, the acceleration is constant ( $a_y = -g$ ) .
Velocity Components:

Since $a_x = 0$ , the horizontal component of velocity ( $v_x$ ) remains constant throughout the motion.
Since $a_y \neq 0$ , the vertical component of velocity ( $v_y$ ) changes continuously.

Speed and Kinetic Energy: The speed ( $v = \sqrt{v_x^2 + v_y^2}$ ) and kinetic energy ( $K = \frac{1}{2}mv^2$ ) depend on $v_y$ , so they change during the flight (decreasing during ascent and increasing during descent).

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