A car is moving with speed of 150km h ^ - 1 and after applying the...

In both cases, the final velocity is zero. Using equation of motion for constant acceleration

${v}^{2} = {u}^{2} + 2as$

$⇒ {0}^{2} - {u}^{2} = - 2a\left(27\right) ... \left(1\right)</p><p>$⇒ {0}^{2} - {\left(\dfrac{u}{3}\right)}^{2} = - 2a{s}^{'} . . . \left(2\right)$</p><p>From \left(1\right)$ and \left(2\right),

$2a \left(27\right)$ = 9 \left(2a{s}^{'}\right)$</p><p>$⇒ {s}^{'} = 3m