7) A nitromethane powered dragster does the strip in 400.0 m strip in 7.400\'s.

Question

7) A nitromethane powered dragster does the strip in 400.0 m strip in 7.400's. What is the dragster's average velocity and average speed in mph? Velocity- 54.05 m/s Speed 120.92 mph Now choose from one of the following options Why? a Average velocity is 194.4 mph in the direction of the finish line and average speed is 194.4 mph. b Average velocity is 194.4 mph and average speed is 194.4 mph in the c Average velocity is 120.8 mph in the direction of the finish line and d Average velocity is 120.8 mph and average speedis 120,8mph in the direction of the finish line. average speed is 120.8 mph direction of the finish line

Explanation / Answer

weknow that Average velocity = total distance /total time

here total distance = 400 m and time = 7.4 seconds

so Average velocity = 54.05 m/s

converting it to mph = 120.9 mph

so here the average velocity and average speed is 120.9 mph , but we know that velocity is a vector quantity so it is defined with magnitude and direction ;on the other side speed is a scaler quantity not a vector ,so it will be defined only by magnitude

so here the correct option is C

Average velocity is 120.8 mph in the direction of the finish line and average speed is 120.8 mph

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