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47. A person travels along a straight road for the first half time with a velocity v1 and second half time with a velocity v2. Then the mean velocity v is givenbyA. V=(v1+v2)/2B. 2/v = (1/v1) + (1/v2)C. v=sqrt(v1+v2)D. v=sqrt(v22/v1)

ANSWER: B

48. A particle moves with uniform acceleration and v1, v2 and V3 denote the average velocities in the three successive intervals of time t1, t2 and t3 Which ofthe following relation is correct?A. (v1 -V2):(V2-v3) = (t1 -t2):(t2 + t3)B. (v1 -V2):(V2 -v3) =(t1 + t2):(t2 + t3)C. (V1-V2):(V2-V3) =(t1 -t2):(t1 -t3)D. (v1 -v2):(V2 -v3) = (t1 -t2):(t2 - t3)

ANSWER: C

50. A body covers the first one-third of the distance with a velocity 'u', the second one third with a velocity 'v' and the remaining with a velocity 'w'. The average velocity v isA. (u+v+w)/3

B. (uv+vw+wu)/3C. 3uvw/(uv+vw+wu)D. (uv+vw+wu)/uvw

ANSWER: A

51. A person travelling on a straight line moves with a uniform velocity v 1 for a distance 'x' and with a uniform velocity v2 for the next equal distance. Theaverage velocity v is given byA. v = (v1+v2)/2B. v = sqrt(v1v2)C. 2/v = (1/v1) + (1/v2)D. 1/v = (1/v1) + (1/v2)

ANSWER: A

The numerical ratio of average velocity to average speed isA. always less than oneB. always equal to oneC. always more than oneD. equal to OR less than one

ANSWER: D

If a body starts from a point and returns back to the same point, then itsA. average velocity is zero but not average speed

B. average speed is zero, but not average velocityC. both average speed and velocity are zeroD. average speed and velocity depend upon the path

ANSWER: A

A particle moves along the "Side of a square of length a starting from A and reaches the opposite corner C by travelling from A to B and from B to C. If the time taken is t, the average velocity of the particle isA. 2a/t

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B. sqrt(2)a/tC. zeroD. l/sqrt(2)t

ANSWER: A

The motion of a particle along X-axis is given by the equation X = 9 + 5t2,where X is distance in cm and t is time in sec. Average velocity during the intervalfrom t = 3 s to t = 5 second in cm/s isA. 40B. 30C. 35D. 50

ANSWER: A

The average velocity of freely falling body is 7 m/s. Then it is released from a height equal toA. 5B. 10C. 15D. 20

ANSWER: A

In the displacement d versus time t graph below, the value of average velocity in the time interval 0 to 20s m/s isA. 1.5B. 4C. 1D. 2

ANSWER: A

A body dropped from certain height reaches the ground after 2 seconds. Average velocity of that body during its motion isA. 4.9

B. 9.8C. 19.6D. 0

ANSWER: A

A.B.C.D.

ANSWER: A

A.B.C.D.

ANSWER: A

A.B.C.

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D.

ANSWER: A

A.B.C.D.

ANSWER: A

A.B.C.D.

ANSWER: A

A.B.C.D.

ANSWER: A