A body is moving due north at 10 m/s. In 1 second the velocity changes to 10 m/s due east. Find the average acceleration of the body.

Question

$$(a)\;zero\;ms^{-2} \quad (b)\;20\;ms^{-2} \quad (c)\;\frac{10}{\sqrt 2} ms^{-2}\quad (d)\;10 \sqrt 2 ms^{-2}$$