16. Which of the following operations will not change a vector?
17. Which one of the following is an example of a vector quantity?
18. Which of the following relations is correct?
19. The basic unit of speed is:
20. A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:
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