Physics

Problem

A body has a velocity of 5\,m/s at

t=0

. It experiences a constant acceleration of 3\,m/s

^2

for the next 4\,s and then an acceleration of

-4\,\text{m/s}^2

for 3\,s. Its velocity at

t=7\,\text{s}

is a)

17\,\text{m/s}

5\,\text{m/s}

-2\,\text{m/s}

29\,\text{m/s}