First slide

Projection Under uniform Acceleration

Question

If a body is projected with an angle θ to the horizontal, then

Moderate

A

its velocity is always perpendicular to its acceleration
B

its velocity becomes zero at its maximum height.
C

its velocity makes zero angle with the horizontal at its maximum height.
D

the body just before hitting the ground, the direction of velocity coincides with the acceleration.

Solution

Acceleration of the projectile is vertically downward.Velocity of projectile can be resolved into horizontal and vertical components.Velocity of the projectile at the highest point is horizontal and it becomes perpendicular to the acceleration , so option -(3) is right.

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