A car covers three successive parts of a journey as follows: • First at a steady…
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A car covers three successive parts of a journey as follows:
• First 30min at a steady speed of 54km/h,
• Next 900s at a steady speed of 20m/s,
• Finally 0.25h at a steady speed of 45km/h.
Use this information to answer the questions below.
(i) Convert all three given speeds to a single common unit of your choice and state that unit clearly.
(ii) Calculate the distance travelled in each part and hence find the total distance covered.
(iii) Compute the average speed of the car for the whole journey in both km/h and m/s, correct to one decimal place.