MEDIUM
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IMPORTANT
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Two forces P and Q, of magnitude 2F and 3F, respectively, are at an angle θ with each other. If the force Q is doubled, then their resultant also gets doubled. Then, the angle θ is:

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Important Questions on Kinematics

EASY
JEE Main
IMPORTANT
Let A=i^ + j^ and B=(2i^- j^) . The magnitude of a coplanar vector C such that A . C=B. C= A . B is given by:
MEDIUM
JEE Main
IMPORTANT
If a body moving in a circular path maintains constant speed of 10 m s-1 , then which of the following correctly describes the relation between acceleration and radius?
MEDIUM
JEE Main
IMPORTANT
A vector A is rotated by a small angle θ radians θ1 to get a new vector B . In that case B-A is :
MEDIUM
JEE Main
IMPORTANT
A projectile is projected with velocity of 25 m s-1 at an angle θ with the horizontal. After t seconds its inclination with horizontal becomes zero. If R represents horizontal range of the projectile, the value of θ will be : [use g=10 m s-2]
MEDIUM
JEE Main
IMPORTANT
From the top of a tower, a ball is thrown vertically upward which reaches the ground in 6 s. A second ball thrown vertically downward from the same position with the same speed reaches the ground in 1.5 s. 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 5 kg is thrown vertically upwards from the ground. The air resistance produces a constant retarding force of 10 N throughout the motion. The ratio of time of ascent to the time of descent will be equal to : [Use g=10 m s-2].
EASY
JEE Main
IMPORTANT
A fly wheel is accelerated uniformly from rest and rotates through 5rad 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 45° with the horizontal. Its velocity after 2 s is 20 m s-1. The maximum height reached by the body during its motion is _____ m. (use g=10 m s-2)