An object moves in a straight line with an initial velocity of

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

8.0\,\text{m/s}

. It experiences a constant acceleration of

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

for an unknown time

t

, after which the acceleration instantly changes to

-3.0\,\text{m/s}^2

for the next

10\,\text{s}

. At the end of the

10\,\text{s}

interval the object is momentarily at rest. Which of the following is the value of

t

? (a)

9.3\,\text{s}

(b)

11\,\text{s}

(c)

6.0\,\text{s}

(d)

15\,\text{s}