Question

10) Niklas and Emil compete on who can ride the 1 km fastest ride. They trample the fastest way they can. Below is a distance-time chart for Niklas cycling and a speed-time chart for Emil's cycling. Note that the charts show different units on the vertical axis. Who won the contest and how many seconds after came second? Look at the link below which shows the graph.

https://storage.omnius.se/exam/exam_1340913030.png

Motivate your answer, and answer thoroughly.

9) A girl stands on a rock edge and throws a rock straight up at the speed of 10 m/s? Describe the rock's position and speed after 2.5 seconds of it being thrown. Motivate your answer and answer thoroughly.

8) A car begins to hit the brakes at the time t = 0 to stop in front of a red light. Which two charts can describe this movement? Motivate your answer here please.

https://storage.omnius.se/exam/exam_1340912061.png

Answer 1

Niklas time distance(s-t) graph is shown below

From the above graph we find Niklas complete 1km in

Emil time speed (t-v) graph is shown below

We find that Emil ride 1000m distance with constant speed of 9 (m/s). So Emil ride 1km distance in

So we find Emil won the race and Nikalas after 130-111.11=18.89s came second.