GCSE Secondary Maths Age 13-17 - Ratio, Proportion & Rates of Change: Changing Units - Explained

The video tutorial explains how to convert 72 kilometers per hour to meters per second. It begins by converting kilometers to meters, noting that 1 kilometer equals 1000 meters, resulting in 72,000 meters. Next, it converts hours to seconds, calculating that there are 3600 seconds in an hour. By dividing 72,000 meters by 3600 seconds, the final answer is 20 meters per second. The tutorial also discusses the marking scheme for this type of question and offers advice on handling similar problems.

How many meters are there in 72 kilometers?

• 720 meters

• 7200 meters

• 72,000 meters

• 7,200,000 meters

What is the conversion factor from kilometers to meters?

• 1 meter

• 100 meters

• 1000 meters

• 10,000 meters

How many seconds are there in one hour?

• 600 seconds

• 3600 seconds

• 360 seconds

• 60 seconds

What is the final speed in meters per second when 72 km/h is converted?

• 18 meters per second

• 20 meters per second

• 22 meters per second

• 24 meters per second

Which of the following is NOT a step in converting 72 km/h to m/s?

• Dividing by 3600

• Multiplying by 1000

• Converting hours to seconds

• Converting kilometers to meters