MEDIUM
JEE Main
IMPORTANT
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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]

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Important Questions on Kinematics

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)
EASY
JEE Main
IMPORTANT
A is a vector quantity such that A= non-zero constant. Which of the following expression is true for A?
EASY
JEE Main
IMPORTANT
Which of the following relations is true for two unit vector A^ and B^ making an angle θ to each other?
MEDIUM
JEE Main
IMPORTANT

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Two identical balls A and B thrown with same velocity 'u' at two different angles with horizontal attained the same range R. If A and B reached the maximum height h1 and h2 respectively, then R=4h1h2

Reason R: Product of said heights, h1h2=u2sin2θ2g·u2cos2θ2g.

MEDIUM
JEE Main
IMPORTANT
Two buses P and Q start from a point at the same time and move in a straight line and their positions are represented by xPt=αt+βt2 and xQt=ft-t2. At what time, both the buses have same velocity ?