Question

Which of the following in not an equation of motion:
(All symbols have their usual meanings)

• A. $v=u+at$
• B. $s=ut+\frac{1}{2}a{t}^2$
• C. v = u + a
• D. $v^2=u^2+2as$

Answer 1

The correct option is C v = u + a

The three equations of motions are:
$v=u+at$
$s=ut+\frac{1}{2}a{t}^2$
$v^2=u^2+2as$
where:
$v=$ final velocity
$u=$ Initial velocity
$a=$ Acceleration
$t=$ Time
$s=$ Displacement

These equations are valid for a body under uniform acceleration.

So, from the options, $v=u+a$,
is not an equation of motion. Note here, that velocity is added to acceleration, which is not allowed.