Question

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

• A. 4 $m{s}^{-1}$
• B. 0 $m{s}^{-1}$
• C. 5.656 $m{s}^{-1}$
• D. 2 $m{s}^{-1}$

Answer 1

The correct option is B

0 $m{s}^{-1}$

Initial velocity u = 4 $m{s}^{-1}$, acceleration a = -4 $m{s}^{-2}$ and distance travelled s = 2m and final velocity v

Using equation of motion,

$v^2=u^2+2as$,

$v^2=4^2+2\times -4\times 2$,

$v^2=16-16$,

So v = 0