\[ \text { QUESTION } 5 \] A bus accelerates from rest to \( 67 \mathrm{~km} / \mathrm{h} \) in 17 seconds; it continues with this speed for 0.04 hrs which is 144 seconds then decelerate at a rate of \( 2.5 \mathrm{~m} / \mathrm{s}^{-2} \) and comes to rest. Plot a velocity time graph for the journey then calculate. 5.1 The total distance covered. 5.2 The average speed for the whole journey

Look at the electrical diagram. \begin{tabular}{l}\( V=8.6 \mathrm{~V} \) \\ \( I 1=0.3 \mathrm{~A} \) \\ \( I 2=0.5 \mathrm{~A} \) \\ \( I 3=0.2 \mathrm{~A} \) \\ Calculate the total resistance. \\ \hline 8.6 \\ \hline OK. \\ \( \begin{array}{l}V=10.6 \mathrm{~V} \\ I 1=0.9 \mathrm{~A} \\ I 2=0.3 \mathrm{~A} \\ I 3=0.3 \mathrm{~A}\end{array} \) \\ Calculate the total resistance. \\ \hline\end{tabular}

7.1 point A cat is sitting on a table admiring a small glass bottle located close to the table edge. Next thing, the bottle is flying off the table horizontally with a speed of \( 1.08 \mathrm{~m} / \mathrm{s} \). At what speed will the bottle hit the floor 0.69 m below the table surface? Ignore effects of air friction.

61 point A freight train moving at a speed of \( 110.5 \mathrm{~km} / \mathrm{hr} \) decelerates at a constant rate in order to stop. What deceleration rate (in \( \mathrm{m} / \mathrm{s}^{2} \) ) must it have in order for it to stop in a distance of 1114 m ? (Deceleration will be a positive number).

4) Un coche que va a \( 72 \mathrm{Km} / \mathrm{h} \), tarda 3 h y 15 minutos en hacer un recorrido. ¿Cuánto tardará otı coche en hacer el mismo recorrido si va a \( 90 \mathrm{~km} / \mathrm{h} \) ?

6. In Activity 12 , if you pull down on the DRFS sensor arm, the DRFS produces a positive reading. How can one justify the statement that the DRFS takes \( u p \) to be the positive direction for the force the spring applies to the mass? (The correct answer uses Newton's Third Law but not \( F=-k y \).)