Question

A body has an initial velocity 4 $m{s}^{-1}$and its final velocity is 1 $m{s}^{-1}$, then what is the acceleration after traveling 2m?

• A. 4 m/s
• B. 0 m/s
• C. √32 m/s
• D. 16 m/s

Answer 1

The correct option is B 0 m/s

Given, initial velocity u = 4 $m{s}^{-1}$, final velocity = 1$m{s}^{-1}$ and distance travelled s = 2 m. Let acceleration be a.

Using equation of motion, $v^2=u^2+2as$

$1^2=4^2+2\times a\times 2$

$1-16=4a$

$a=\frac{-15}{4}=-3.75m{s}^{-2}$(negative sign shows it is retardation)