Calculating Stopping Distances and Speeds

The video tutorial explains how to calculate the stopping distance of a car driven by Sophie at 70 km/h. It covers the conversion of speed from kilometers per hour to meters per second, calculation of reaction distance using reaction time, and the use of a formula to determine braking distance. Finally, it combines these distances to find the total stopping distance, rounded to the nearest meter.

What is Sophie's initial speed in kilometers per hour?

• 80 km/h

• 90 km/h

• 60 km/h

• 70 km/h

What is the formula given for braking distance?

• d = 0.1 v

• d = 0.1 v^2

• d = 0.01 v^2

• d = 0.01 v

What two components make up the stopping distance?

• Reaction distance and braking distance

• Braking distance and speed

• Reaction time and speed

• Speed and time

How do you convert speed from km/h to m/s?

• Divide by 1.5

• Multiply by 1.5

• Divide by 3.6

• Multiply by 3.6

What is the converted speed of Sophie in meters per second?

• 20 m/s

• 19.9 m/s

• 19.4 m/s

• 19 m/s

What is the reaction time of Sophie?

• 1 second

• 1.5 seconds

• 2.5 seconds

• 2 seconds

How is the reaction distance calculated?

• Speed in km/h multiplied by reaction time

• Speed in km/h divided by reaction time

• Speed in m/s multiplied by reaction time

• Speed in m/s divided by reaction time

What is the calculated reaction distance?

• 29 meters

• 28 meters

• 30 meters

• 31 meters

What is the significance of the reaction distance in stopping?

• It determines the speed

• It affects the total stopping time

• It is the time taken to apply brakes

• It is the distance covered during reaction time

What is the braking distance when calculated using the formula?

• 49 meters

• 45 meters

• 46 meters

• 48 meters