For the first 3 ,min of his journey to school, Rahul jogs at

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

Problem

For the first 3\,min of his journey to school, Rahul jogs at

4\,\text{m s}^{-1}

. During the next 4\,min he walks at

6\,\text{km h}^{-1}

. Taking the entire 7\,min together, determine Rahul's average speed in

\text{m s}^{-1}

. (a)

3.1\text{ m/s}

(b)

2.7\text{ m/s}

(c)

2.0\text{ m/s}

(d)

2.83\text{ m/s}