A car moving on a straight test track has the following velocities at different…

PHYSICS · Multi-part · CBSE · Physics · Motion in a Straight Line · Motion in a Straight Line

Problem

A car moving on a straight test track has the following velocities at different instants: • at

t = 2.0\,\text{s}

v = 10\,\text{m s}^{-1}

• at

t = 7.0\,\text{s}

v = 34\,\text{m s}^{-1}

• at

t = 14.0\,\text{s}

v = 22\,\text{m s}^{-1}

(i) Calculate the average acceleration during the interval

2.0\,\text{s}

7.0\,\text{s}

. (ii) Calculate the average acceleration during the interval

7.0\,\text{s}

14.0\,\text{s}

. (iii) Calculate the average acceleration for the overall interval

2.0\,\text{s}

14.0\,\text{s}

. State whether the acceleration is positive or negative in each case.