EASY
JEE Main
IMPORTANT
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Two vectors P and Q have equal magnitudes. If the magnitude of P+Q is n times the magnitude of P-Q, then angle between P and Q is

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Important Questions on Kinematics

EASY
JEE Main
IMPORTANT
A body rotating with an angular speed of 600 rpm is uniformly accelerated to 1800 rpm in 10 sec. The number of rotations made in the process is
MEDIUM
JEE Main
IMPORTANT
What will be the projection of vector A=i^+j^+k^ on vector B=i^+j^ ?
MEDIUM
JEE Main
IMPORTANT
Three particles P, Q and R are moving along the vectors A=i^+j^,  B=j^+k^ and C=-i^+j^, respectively. They strike on a point and start to move in different directions. Now particle P is moving normal to the plane which contains vector A and B. Similarly particle Q is moving normal to the plane which contains vector A and C. The angle between the direction of motion of P and Q is cos-11x. Then the value of x is          .
EASY
JEE Main
IMPORTANT

Match List I with List II.

List I List II
(a) C-A-B=0 (i) Question Image
(b) A-C-B=0 (ii) Question Image
(c) B-A-C=0 (iii) Question Image
(d) A+B=-C (iv) Question Image

Choose the correct answer from the options given below:

MEDIUM
JEE Main
IMPORTANT
Water droplets are coming from an open tap at a particular rate. The spacing between a droplet observed at 4th second after its fall to the next droplet is 34.3 m. At what rate the droplets are coming from the tap ? (Take g=9.8 m s-2)
HARD
JEE Main
IMPORTANT
The relation between time t and distance x for a moving body is given as t=mx2+nx, where m and n are constants. The retardation of the motion is: (When v stands for velocity)
HARD
JEE Main
IMPORTANT
A balloon was moving upwards with a uniform velocity of 10 m s-1. An object of finite mass is dropped from the balloon when it was at a height of 75 m from the ground level. The height of the balloon from the ground when object strikes the ground was around: (takes the value of g as 10 m s-2)
HARD
JEE Main
IMPORTANT
The instantaneous velocity of a particle moving in a straight line is given as v=αt+βt2, where α and β are constants. The distance travelled by the particle between 1 s and 2 s is: