A car increases its velocity uniformly from to in the first and then keeps moving…

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

Problem

A car increases its velocity uniformly from

10\,\text{m/s}

30\,\text{m/s}

in the first

5\,\text{s}

and then keeps moving with this speed for the next

5\,\text{s}

. Which one of the following statements is correct? (a) The average acceleration during the entire

10\,\text{s}

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

and the instantaneous acceleration at

t = 7\,\text{s}

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

. (b) The average acceleration during the entire

10\,\text{s}

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

and the instantaneous acceleration at

t = 7\,\text{s}

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

. (c) The average acceleration during the entire

10\,\text{s}

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

and the instantaneous acceleration at

t = 7\,\text{s}

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

. (d) The average acceleration during the entire

10\,\text{s}

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

and the instantaneous acceleration at

t = 3\,\text{s}

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