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A particle is projected with a velocity making an angle with the horizontal. At an instant, its velocity is at right angle to its initial velocity . Then, is
(a)
(b)
(c)
(d)

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Important Questions on Motion in a Plane
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Two balls, and , are thrown with speeds and , respectively. Both the balls cover the same horizontal distance before returning to the plane of projection. If the angle of projection of ball is with the horizontal, then the angle of projection of is

MEDIUM
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IMPORTANT
A projectile can have the same range for two angles of projection. If and are the times of flights in the two cases, then

MEDIUM
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IMPORTANT
A cannon ball has a range on a horizontal plane(for ground to ground projectile motion). If and are the greatest heights in the two paths for which this is possible, then

EASY
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IMPORTANT
Two seconds after projection, the projectile is travelling in a direction inclined at to the horizontal and after one more second, it is travelling horizontally. The magnitude and direction of its initial velocity, respectively, are

EASY
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IMPORTANT
If a ball is thrown from the ground level to just cross a wall high, at a distance of and falls at a distance of from the wall, then the magnitude of the velocity of the ball is

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IMPORTANT
Horizontal range and the maximum height of a projectile are and , respectively. If a constant horizontal acceleration, , is given to the projectile due to air, then what will be the horizontal range and the maximum height of the projectile, respectively?

HARD
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A particle is projected from the ground with velocity , at an angle to the horizontal. The average velocity of the particle between the point of projection and the maximum height of projectile is

MEDIUM
NEET
IMPORTANT
A particle is projected from a tower, as shown in the figure. The distance from the foot of the tower where it will strike the ground will be (Take )
