A cyclist starts from rest. The table shows the speedometer readings every 15 seconds:

\begin{array}{|l|c|c|c|c|c|c|c|}\hline \text{time / s} & 0 & 15 & 30 & 45 & 60 & 75 & 90 \\ \hline \text{speed / }(\text{m s}^{-1}) & 0 & 2 & 4 & 6 & 6 & 6 & 6 \\ \hline \end{array}

Which of the following correctly describes the cyclist's motion in the first 45 seconds and in the last 45 seconds?

First 45 s: zero acceleration; last 45 s: at rest

First 45 s: zero acceleration; last 45 s: constant speed

First 45 s: non-zero acceleration; last 45 s: constant speed

First 45 s: non-zero acceleration; last 45 s: at rest

A cyclist starts from rest. The table shows the speedometer readings every 15 seconds:

\begin{array}{|l|c|c|c|c|c|c|c|}\hline \text{time / s} & 0 & 15 & 30 & 45 & 60 & 75 & 90 \\ \hline \text{speed / }(\text{m s}^{-1}) & 0 & 2 & 4 & 6 & 6 & 6 & 6 \\ \hline \end{array}

Which of the following correctly describes the cyclist's motion in the first 45 seconds and in the last 45 seconds?

First 45 s: zero acceleration; last 45 s: at rest

First 45 s: zero acceleration; last 45 s: constant speed

First 45 s: non-zero acceleration; last 45 s: constant speed

First 45 s: non-zero acceleration; last 45 s: at rest

Motion

Motion Questions