EASY
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IMPORTANT
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The initial speed of a projectile fired from ground is u. At the highest point during its motion, the speed of projectile is 32u. The time of flight of the projectile is:

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Important Questions on Kinematics

MEDIUM
JEE Main
IMPORTANT
The speed of a swimmer is 4 km h-1 in still water. If the swimmer makes his strokes normal to the flow of river of width 1 km, he reaches a point 750 m down the stream on the opposite bank. The speed of the river water is ______ km h-1.
EASY
JEE Main
IMPORTANT
A body is moving with constant speed, in a circle of radius 10 m. The body completes one revolution in 4 s. At the end of 3rd second, the displacement of body (in m) from its starting point is:
EASY
JEE Main
IMPORTANT
A stone of mass 1kg is tied to end of a massless string of length 1 m. If the breaking tension of the string is 400 N, then maximum linear velocity, the stone can have without breaking the string, while rotating in horizontal plane, is:
EASY
JEE Main
IMPORTANT
Two bodies are projected from ground with same speeds 40 m s-1 at two different angles with respect to horizontal. The bodies were found to have same range. If one of the body was projected at an angle of 60°, with horizontal then sum of the maximum heights, attained by the two projectiles, is _____ m. (Given g=10 m s-2)
EASY
JEE Main
IMPORTANT

An object moves with speed v1, v2 and v3 along a line segment AB, BC and CD respectively as shown in figure. Where AB = BC and AD = 3 AB, then average speed of the object will be :

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EASY
JEE Main
IMPORTANT
A child stands on the edge of the cliff 10 m above the ground and throws a stone horizontally with an initial speed of 5 m s1 . Neglecting the air resistance, the speed with which the stone hits the ground will be _____ m s1 (given, g = 10 m s2  ).
EASY
JEE Main
IMPORTANT
For a body projected at an angle with the horizontal from the ground, choose the correct statement
EASY
JEE Main
IMPORTANT
For a train engine moving with speed of 20 ms1, the driver must apply brakes at a distance of 500 m before the station for the train to come to rest at the station. If the brakes were applied at half of this distance, the train engine would cross the station with speed x ms-1. The value of x is ______. (Assuming same retardation is produced by brakes)