Question

a car traveled 620.1 kilometers after 10 hours. what was the average speed of the car, rounded to the appropriate number of significant figures? use the keypad to enter your answer in the boxes. final answer: the average speed of the car was kilometers per hour when rounded to the correct number of significant figures.

Explanation:

Step1: Determine significant figures for 620.1

Non - zero digits and zeros between non - zero digits are significant. So, 620.1 has 4 significant figures.

Step2: Determine significant figures for 10

Trailing zeros in a number without a decimal are ambiguous. But in some cases (like when it's a measurement result), if it's written as 10 (no decimal), it has 2 significant figures.

Step3: Calculate average speed

The formula for average speed \(v=\frac{d}{t}\), where \(d = 620.1\) km and \(t=10\) h. So \(v=\frac{620.1}{10}=62.01\) km/h. When multiplying or dividing, the result should have the same number of significant figures as the number with the least number of significant figures. Since 10 has 2 significant figures, we round 62.01 to 62 km/h.

Answer:

• For 620.1: 4
• For 10: 2
• Final answer: 62