When should the equation velocity=displacement/time be used instead of using these equations like v=u+at?

Question

When should the equation velocity=displacement/time be used instead of using these equations like v=u+at, v^2=u^2+2as, s=ut+1/2at^2 or s=1/2(u+v)t be used.
When should we use the u,v,s,t equations be used.
When should the equation velocity=displacement/time be used??

Answer 1

It depends whether your body is accelerating or not.

If not, ie moving at constant speed, you can use v=d/t

If it is accelerating and the acceleration is constant you can use the UVAST formulae.

[If the acceleration is not constant then you are up Sh*t creek with no paddle unless you have a formula for the acceleration and knowledge of calculus!!!]

Answer 2

hiya I see that your instructor did no longer clarify the fundamentals first. once you have the information that represents any 2 of the variables from velocity, displacement and time then use the ordinary formulation. yet in spite of the indisputable fact that in case you come across words like preliminary velocity, very final velocity, terminal velocity, loose fall etc..... then use the subsequent set of equations(newton's). in spite of the indisputable fact that in case you keenly word then you will discover that all and sundry the three equations of action additionally symbolize the 1st equation below some or the different circumstnace.

Answer 3

when a particle is moving with uniform velocity,then you should use the equation v=displacement/time
When the particle is moving with an uniform acceleration,then you should use any of the three equations of motiondepending on the data given .If three of the quantities are known, you can find the fourth one.
s=1/2(u+v) is to be used to find the average velocity

Answer 4

v = u + at
should be used when the body is uniformly accelerated


velocity = displacement/time is used when the body is in uniform motion

Answer 5

one is for instantanious velociy and the newtonian equantions are for average velocity i think