Assertion: Horizontal component of velocity is constant in a projectile motion under gravity.

Reason: Acceleration is along the vertical direction in projectile motion under gravity.

Assertion : A stone is projected (not vertically upwards) from level ground . The average velocity of this stone is in horizontal direction in between the two instants of time when velocity of stone makes same angle( in magnitude) with horizontal . ( Neglect air friction)

Reason : The average velocity of a projectile ( not projected vertically upwards) in between any two instants of time is always in horizontal direction.

Assertion : In projectile motion, when horizontal range is $n$ times the maximum height, the angle of projection is given by $\tan \theta =\frac{4}{n}$

Reason : In the case of horizontal projection the vertical velocity increases with time.

Assertion: Path of projected ball becomes parabolic in gravitational field $\left(\theta \ne 90°\right)$.

Reason: Gravitational force always act perpendicular to velocity during the motion.

Assertion : in projectile motion the projectile hits the ground with the same velocity with which it was thrown.

Reason : In projectile motion horizontal velocity remains same but vertical velocity continuously change and particle strikes the ground with same vertical velocity with which the particle was thrown in vertical direction.

Assertion: In projectile motion, the vertical velocity of the particle is continuously decreased during its ascending motion.

Reason: In projectile motion, downward constant acceleration is present in vertical direction.

Assertion : The path of one projectile as seen from another projectile is a straight line.

Reason : Two projectiles projected with same speed at angles $\alpha$ and $\left(90°-\alpha \right)$ have same range.

Assertion: In case of projectile motion, acceleration, horizontal component of velocity and mechanical energy remains unchanged but speed, vertical component of velocity, momentum, $\mathrm{K}.\mathrm{E}.$ and $\mathrm{P}.\mathrm{E}.$ change.

Reason: In the presence of air resistance, the range and maximum height attained reduce, but time of flight increases.

Assertion: In the projectile motion, projected body behave just like a freely falling body.

Reason: There is no change in linear momentum in projectile motion.