8/3/2019 physics @ Viresh_iitk // 1 D

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Kinematics -1dimensional motion / 11th //AIEEE;AIPMT;JEE1-In a straight line motion , match the velocity-time graphs given in the column

A to the correct displacement-time graph given in the column-B :

COLUMN-A COLUMN-B

2- Displacement s of a particle and time t are related as: t = s2 + s where and are some positive constants. The retardation and the velocity are related as :

(a) 2 v3 (b) 2 v3 (c) 2 v3 (d) 2 2v3

3- When a particle is at distance x from origin O its accelerationdirected towardsorigin is proportional to 1/ x2. The particle was released at x=20 m. It reaches withvelocity 12 m / s at x=10 m. With what velocity the particle reaches at x=4m ?

(a) 123 m/s (b) 30 m/s (c) 122 m/s (d) 24m/s

8/3/2019 physics @ Viresh_iitk // 1 D

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Kinematics -1dimensional motion / 11th //AIEEE;AIPMT;JEE4- Velocity of a particle moving on the x-axis , is changing as: v =10-2 x m/s wherex is in meters. Then at x=1 the particle experiences ( in m/s2 )(a) acceleration of 8 (b) acceleration of 16 (c) retardation of 8 (d)

retardation of 16

5 - In previous problem if at time t=0 particle was at x=1 then its velocity at any

time t will be(a) 8 e-2 t (b) 16e-2 t (c) 8 e2 t (d) 16 e2 t

6- A ball is projected upward in uniform gravitational field. The average velocity inlower half of the path is k times the average velocity in upper half. Then k =(a) 1.41 (b) 2 (c) 2.41 (d) 0.7

7- A ball released from rest , falls by 55 m in last one second before hitting theground. The height of the ball from ground, 2 second before hitting it, would be(a) 100 m (b) 60 m (c) 80 m (d) 40 m