Motion In A Plane

Physics
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If a particle moves in a circle, describing equal angles in equal intervals of time, the velocity vector:

A
Remains constant.
B
Changes in magnitude.
C
Changes in direction.
D
Changes both in magnitude and direction.
Medium
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Assertion (A): In the motion of projectile the horizontal component of velocity remains constant 
Reason (R) : The force on the projectile is the gravitational force which acts only in the vertically downward direction

A
A and R are correct and R is the correct explanation of A
B
A and R are correct and R is not the correct explanation of A
C
A is true and R is false 
D
A is false and R is true
Medium
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For a projectile, the physical quantities which remain constant are:

A
vertical component of velocity and kinetic energy.
B
potential energy and kinetic energy.
C
acceleration and horizontal component of velocity 
D
potential energy and acceleration.
Medium
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At the maximum height of a projectile, the velocity and acceleration are

A
parallel to each other
B
antiparallel to each other
C
perpendicular to each other
D
inclined to each other at
Medium
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