Question

In an experiment, time can be calculated correct to one second and length correct to one millimetre. Which amongst the following speed is most accurate and why?

• A. 2.95 ms^-1
• B. 2.96 ms^-1
• C. 2.957 ms^-1
• D. 2.9 ms^-1

Answer 1

The correct option is C

2.957 ms^-1

It is because the accuracy is determined by maximum accuracy with which various quantities are measured. As time can be measured correct to 1s only and length can be measured correct to 1 mm (or 0.001 m) therefore the most accurate answer is 2.957ms^-1