Question

The initial position of an object at rest is given by 3i-8j. It moves with constant acceleration and reaches to the position 2i+4j after 4s. What is its acceleration?

Answer 1

let the first vector be r1 and second vector be r2

resultant r equals r2-r1
find magnitude of r
magnitude of r equals s

$s = 0.5 \times a \times {t}^{2}$
(ut equals zero since initial velocity is zero)
where a equals acceleration (to find)
and t equals time interval( given 4 seconds)