Which one of the following remains constant while throwing a ball upward?

When a ball is thrown vertically upward, it moves under the sole influence of gravity, assuming air resistance is negligible. According to the principles of vertical projectile motion, the object experiences a constant downward acceleration due to gravity, denoted as g (approximately 9.8 m/s²) [t1][t6]. While the acceleration remains constant in both magnitude and direction throughout the flight [t6][t7], other parameters change. The velocity decreases as the ball rises, momentarily becomes zero at the peak, and then increases as it falls [c1][t6]. Consequently, the kinetic energy (which depends on velocity) also varies, reaching its minimum at the highest point [t1][t3]. Displacement changes continuously as the ball's position relative to the starting point shifts during its ascent [t2][t4]. Therefore, only acceleration remains constant during the upward motion [t6][t8].

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > Activity 5.8: Let us observe > p. 72