IIT JEE , AIEEE Forum - Physics , Mechanics - how can the acceleration of the body is constant if velocity be 0

venktesh

how can the acceleration of the body is constant if velocity be 0

budokai_tenkaichi_returns

vel =0

acc=0

0 is a constant buddy

harsha_27

It can be.Take the case of body thrown upwards,its velocity at highest point is 0 but still its acceleration is g directed downwards which is constant throughout its motion.

djdylan2000

a=dv/dt. , a can be zero if v does not change over a time interval dt. zero is a constant too.

1iitian2009

yes he is right a

rtiit

acceleration is defined as the rate of change of velocity with respect to time

if velocity is constant(0 is a constant), it means that change in velocity is zero and so is the rate of change of it i.e. acceleration=0

bsravan2020

it is possible when a body is momentarily at rest ,, for example abody thrown vertically upwards has zero vel but definite acc.

rtiit

a body thrown vertically upwards has zero vel but definite acc.

Can u xplain plz............??

studyid

@ rtit :

when a body is thrown upwards then at the highest point the velocity becomes zero but still the gravitational acceleration acts on it and it is constant. so acceleration is definite where as the velocity is zero.

a_JOSHI

see dude acceleration is dv/dt and as v=0, dv/dt is a constant which is acceleration...hence accl is constant...and for u rtiit i think its coz of the g acting downwards....so accl is definite...

smile.pulkit

hey,

velocity is a theoritical concept which is a vector quantity...

there can be instance when vel. is 0 but speed is not 0
hence accelleration will not neccessary b 0

it IS A THEROTICAL CONCEPT

varun.tinkle

IT IS SIMPLE
IN THIS SITUATION V=U
A=V-U/T=0/T=0
ACC IS CONSTANT COZ THE FINAL VELOCITY = INITIAL VELOCITY AT ALL TIMES
IN OTHER WORDS SINCE ACC IS 0 AT ALL TIMES IT IS CONSTANT
SIMPLE
PLZ RATE ME IF U FIND ME USEFUL
!!!!!!CHEERS!!!!!!!!!

studyid

@ varun :

it is not necessary that acceleration is 0 so it is constant ...

in every case u cant say that

Suhail20

if V is 0 den dv/dx is 0.difeerentail of a constant is o so A is constant.

gauravtargetsiit

When acceleration is constant(not zero) then only instantaneous velocity (dx/dt) can be zero but not the velocity for an extended time period.
Take for example the case of a body thrown upwards, its velocity at the top most point is zero(instantaneously) although it has constant acceleration 'g' .

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