MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Time and Speed

76. Mark the ...

Question

76. Mark the correct statement 1. If velocity and acceleration have opposite sign, then speed of particle will increase 2. If velocity is zero at an instant then acceleration of particle will be zero at that instant 3. If the velocity is zero in a time interval then acceleration is not equal to zero at any instant within the time interval 4. A particle can move along X axis only. If it's X coordinate and velocity has opposite sign then particle will move towards origin

Open in App

Solution

Suggest Corrections

thumbs-up

14

Similar questions

Q. Assertion :A particle may be momentarily at rest and yet have non-zero acceleration Reason: The zero velocity of a particle at any instant does not necessarily imply zero acceleration at that instant.

Q. A particle is moving along x-axis has acceleration

f

t

f = f_{0} (1 - \frac{t}{T})

f_{0}

T

are constants. The particle at

t = 0

has zero velocity. In the time interval between

t = 0

and the instant when

f = 0

, the velocity(

v_{a}

) of the particle is then

Q. A particle moving along

x -

axis has acceleration

f

t

f = f_{0} (1 - \frac{t}{T}),

f_{0}

and T are constants. The particle at

t = 0

has zero velocity. In the time interval between

t = 0

and the instant when

f = 0

, the particle's velocity

v_{x}

Q. The position of a particle moving along x-axis given by

x = (- 2 t^{3} + 3 t^{2} + 5) m

. The acceleration of particle at the instant its velocity becomes zero is

Q. Read each statement below carefully and state with reasons and examples, if it is true or false ; A particle in one-dimensional motion (a) with zero speed at an instant may have non-zero acceleration at that instant (b) with zero speed may have non-zero velocity, (c) with constant speed must have zero acceleration, (d) with positive value of acceleration must be speeding up.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Time, Average Speed and Velocity

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard IX Physics

Join BYJU'S Learning Program

CrossIcon