The velocity of a particle moving along a line decreases linearly from at to at

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

Problem

The velocity of a particle moving along a line decreases linearly from

4\text{ m/s}

t=0\text{ s}

-2\text{ m/s}

t=2\text{ s}

. Which statement best describes the particle’s acceleration for

0<t<2

? (a) It is constant at

3\text{ m/s}^2

. (b) It is constant at

-3\text{ m/s}^2

. (c) It is

3\text{ m/s}^2

for

0<t<1

and

-3\text{ m/s}^2

for

1<t<2

. (d) It is constant at

-1.5\text{ m/s}^2