A scooter is moving forward at and is brought to rest in under uniform retardation

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A scooter is moving forward at

54\,\text{km}\,\text{h}^{-1}

and is brought to rest in

5\,\text{s}

under uniform retardation. Taking the forward direction as positive, what is the acceleration during this interval? (a)

-10.8\,\text{m}\,\text{s}^{-2}

(b)

+3\,\text{m}\,\text{s}^{-2}

(c)

-3\,\text{m}\,\text{s}^{-2}

(d)

+10.8\,\text{m}\,\text{s}^{-2}