The velocity of a particle is given by $v=5-t^2 m/s.$ The average acceleration of the particle between 3 and 5 seconds will be

Question

$$(a)\;2 m/s^2 \quad (b)\;-8 m/s^2 \quad (c)\;-14 m/s^2 \quad (d)\;9 m/s^2$$