Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 55

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A point object traverses half the distance with velocity $v_{0} .$ The remaining part of the distance is covered with velocity $v_{1}$ for the half-time and with velocity $v_{2}$ for the rest half. The average velocity of the object for the whole journey is

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Important Questions on Kinematics

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 56

Select the incorrect statements from the following.

S 1

: Average velocity is path length divided by time interval.

S 2

: In general, the average speed is greater than the magnitude of the average velocity.

S 3

: A particle moving in a given direction with a non-zero velocity can have zero speed.

S 4

: The magnitude of average velocity is the average speed.

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 57

If

x

denotes displacement in time

t

and

x = a \cos t

, then acceleration is:

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 58

The velocity-time relation of an electron starting from rest is given by

u = k t

, where

k = 2 m s^{- 2} .

The distance traversed in

3 \sec

is:

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 59

The position

x

of a particle varies with time

(t)

as

x = {at}^{2} - {bt}^{3} .

The acceleration at time

t

of the particle will be equal to zero, where

t

is equal to:

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 60

A particle moves along a straight line such that its displacement at any time

t

is given by

s = t^{3} + 6 t^{2} + 3 t + 4

metres. The velocity when the acceleration is zero is:

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 61

The displacement of a particle starting from rest (at

t = 0

) is given by

s = 6 t^{2} - t^{3}

. The time when the particle will attain zero velocity again is:

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 62

The velocity of a body depends on time according to the equation

v = 20 + 0.1 t^{2} .

The body has:

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 63

The displacement of a particle is given by

y = a + bt + {ct}^{2} - {dt}^{4} .

The initial velocity and acceleration are respectively: