Assertion: Two stones are simultaneously projected from level ground from same point with same speeds, but different angles with horizontal. Both stones move in same vertical plane. Then the two stones may collide in mid-air.

Reason: For two stones projected simultaneously from same point with same speed at different angles with horizontal, their trajectories never intersect at any point.

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.