Explain all the 3 derivations s=ut+1 2at 2 v=u+at 2as=v 2 -u 2
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EQUATIONS OF MOTION
1. VELOCITY-TIME RELATION
Acceleration=change in velocity/time
i.e.,a=v-u/t
v-u= at
v=u+at
2.DISPLACEMENT- TIME RELATION
Displacement= average velocity×time
s= (v+u)÷2×t
=(u+at+u)÷2×t{v=u+at}
=(2u+at)÷2×t
=(2u÷2 + at÷2)t
= (u+at/2)t
= ut + 1/2 at 2
VELOCITY-DISPLACEMENT RELATION
v=u+at
squaring
v 2 = (u+at) 2
= u 2 + 2×u×at+ (at) 2
= u 2 + 2uat + a 2 t 2
= u 2 + 2a ( ut + 1/2 at) 2
= u 2 + 2as
{ ut+ 1/2 at 2 =s}
therefore, v 2 = u 2 + 2as
1. VELOCITY-TIME RELATION
Acceleration=change in velocity/time
i.e.,a=v-u/t
v-u= at
v=u+at
2.DISPLACEMENT- TIME RELATION
Displacement= average velocity×time
s= (v+u)÷2×t
=(u+at+u)÷2×t{v=u+at}
=(2u+at)÷2×t
=(2u÷2 + at÷2)t
= (u+at/2)t
= ut + 1/2 at 2
VELOCITY-DISPLACEMENT RELATION
v=u+at
squaring
v 2 = (u+at) 2
= u 2 + 2×u×at+ (at) 2
= u 2 + 2uat + a 2 t 2
= u 2 + 2a ( ut + 1/2 at) 2
= u 2 + 2as
{ ut+ 1/2 at 2 =s}
therefore, v 2 = u 2 + 2as
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