A cyclist slows down uniformly from to rest in

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

Problem

A cyclist slows down uniformly from

15\,\text{m/s}

to rest in

5\,\text{s}

. Which description best represents the velocity–time graph during this period? (a) Straight line slanting upward from

0\,\text{m/s}

t=0

15\,\text{m/s}

t=5\,\text{s}

(b) Curve slanting downward, becoming flatter, starting at

15\,\text{m/s}

and touching

0\,\text{m/s}

t=5\,\text{s}

15\,\text{m/s}

t=0

0\,\text{m/s}

t=5\,\text{s}

(d) Horizontal line at

15\,\text{m/s}

throughout the

5\,\text{s}

interval