MEDIUM
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IMPORTANT
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Two forces and , of magnitude and , respectively, are at an angle with each other. If the force is doubled, then their resultant also gets doubled. Then, the angle is:
(a)
(b)
(c)
(d)

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Important Questions on Kinematics
EASY
JEE Main
IMPORTANT
Let . The magnitude of a coplanar vector such that is given by:

MEDIUM
JEE Main
IMPORTANT
If a body moving in a circular path maintains constant speed of , then which of the following correctly describes the relation between acceleration and radius?

MEDIUM
JEE Main
IMPORTANT
A vector is rotated by a small angle radians to get a new vector . In that case is :

MEDIUM
JEE Main
IMPORTANT
A projectile is projected with velocity of at an angle with the horizontal. After seconds its inclination with horizontal becomes zero. If represents horizontal range of the projectile, the value of will be : []

MEDIUM
JEE Main
IMPORTANT
From the top of a tower, a ball is thrown vertically upward which reaches the ground in . A second ball thrown vertically downward from the same position with the same speed reaches the ground in . A third ball released, from the rest from the same location, will reach the ground in _____ s.

MEDIUM
JEE Main
IMPORTANT
An object of mass is thrown vertically upwards from the ground. The air resistance produces a constant retarding force of throughout the motion. The ratio of time of ascent to the time of descent will be equal to : [Use ].

EASY
JEE Main
IMPORTANT
A fly wheel is accelerated uniformly from rest and rotates through in the first second. The angle rotated by the fly wheel in the next second, will be :

HARD
JEE Main
IMPORTANT
A body is projected from the ground at an angle of with the horizontal. Its velocity after is . The maximum height reached by the body during its motion is _____ . (use )
