An object moving in a straight line experiences an acceleration of for the first

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

Problem

An object moving in a straight line experiences an acceleration of

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

for the first

5\,\text{s}

, followed by an acceleration of

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

for the next

4\,\text{s}

. If the object’s initial velocity is

4\,\text{m/s}

, what is its velocity at the end of the

9\,\text{s}

interval? (a)

19\,\text{m/s}

(b)

13\,\text{m/s}

(c)

11\,\text{m/s}

(d)

7\,\text{m/s}