2. Check the meaning of the words in the box. Then read the equations and answer questions 1–2.
(Kiểm tra nghĩa của các từ trong hộp. Sau đó đọc các phương trình và trả lời các câu hỏi 1–2.)
distance (cự ly) time (thời gian) average speed (tốc độ trung bình) calculate (tính) equation (phương trình) |
The winner of the race is the person who has the fastest average speed.
To calculate average speed, you need the following equation:
distance/ time = average speed
distance: the race was 200m.
time: Fields completed the 200m in 161seconds.
So, average speed:
200/161 = 1.24 metres a second (m/s)
To calculate average speed in kilometres anhour (km/h), use this equation:average speed in m/s × 3.6 = average speedin km/h.
1. Look again at the table in exercise 1. Calculate the average speed of Gomez, Jones and O’Hara in m/s.
2. Now calculate the average speed of all the swimmers in km/h.
1.
Gomez = 1.31 m/s
Jones = 1.25 m/s
O'Hara = 1.32 m/s
2.
Fields = 4.46 km/h
Gomez = 4.71 km/h
Jones = 4.5 km/h
O'Hara = 4.74 km/h
