Physics

Problem

A particle has the following velocity–time description: • From

t = 0

t = 4\,\text{s}

, its velocity increases uniformly from

0

20\,\text{m\,s}^{-1}.

• From

t = 4\,\text{s}

t = 8\,\text{s}

, its velocity remains constant at

20\,\text{m\,s}^{-1}.

Which statement about the particle’s acceleration during

0

–

8\,\text{s}

is correct? a) It is

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

throughout the entire

8\,\text{s}

. b) It is

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

throughout the entire

8\,\text{s}

. c) It is

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

for the first

4\,\text{s}

and

0

for the next

4\,\text{s}

. d) It is

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

for the first

4\,\text{s}

and

0

for the next

4\,\text{s}