IIT JEE , AIEEE Forum - Physics , Mechanics

dilip

what r instantaneous and average velocities

plz explain with examples

aditya_arora04

Hi,

Look,

Average velocity : Total DISLACEMENT divided by total time taken.

Instantaneous velocity : Velocity at a particular moment.

sid_2222000

instantaneous velocity is the displacement made by an object in an instant......while average velocity is the displacement made by the body over a longer measureable period .......

sid_2222000

average velocity can also be defined as the average of initial and final velocities(acc. to the weightages, more the time a particular velocity covers more is its weightage)
do rate if u like the ans

kghedriu

well......a bit to stress.........assuming initial n final velocitites as v1 and v2.....

average velocity is given as 1/2*[v1+v2]

and instantaneous velocity is given by ds/dt.....

note that bold letters represent scalars......

partha

well all is said above but let me tell about the directions of instanteneous and avg vel
avg velocity has its dirn along the net disp
but instantaneous vel has its dirn along the tangent to its path at that instant
for ex if a body has moved over half a semicircle then its avg vel will be along the radius whereas its inst vel will be along the tangent to the circumference at that instant

sneha_91

instantaneous velocity is the velocity at a instant of time .here the time tends to approach zero whereas average velocity is change in displacement divided by change in time

please rate me

punterjack

average velocity after a time interval of 't' is the total displacement in that interval of time/t .

instantanous velocity at point of time t is

_{[ t]}

_{[0 ]}

s/

t in short the displacement undergone at that infinisimally small interval of time or the velocity vector at that given instant of time.

please rate me if u found my explanation satisfactory

punterjack

eg. when a particle moves in a circular path with uniform speed v and has covered 1/4th the circle in time t

its average v=

2 r/t

it instanous velocity = v

Ask & Discuss Questions with Community & Experts