Q12 (c) (ii)

Criteria	Marks
Provides correct solution	2
Finds a correct equation for acceleration and attempts to integrate, or equivalent merit	1

Sample answer:

$m\vec a=-mg\sin\theta\,\vec i$
$\vec a=-g\sin\theta\,\vec i$
$\frac{d\vec v}{dt}=-g\sin\theta\,\vec i$
$\vec v=-gt\sin\theta\,\vec i+\vec C$

But when $t=0$, $\vec v=0$.

$\text{So }\vec v=-gt\sin\theta\,\vec i$