How do you calculate cruising speed of the Perserverance spacecraft?

Feb 19, 2021
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The Perserverence Rover spacecraft travelled 472 million Km over 203 days (4872 hours) to get to Mars.

If you divide this distance by the time, you get a speed of 96,880 Km/hr ... which can't be correct.

This spacecraft departed earth at a speed of 39,600 Km/hr.

Why is there such a large discrepancy between my calculation and the actual cruising speed?

Maybe someone can point out the error in my calculation.
 
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Dec 9, 2020
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Is think that travel to Mars was done in individual stages eg: x number of hours at 39,600 km/hr; then another stage for another amount of hours at a different speed, etc, etc. I suggest trying to get detailed data on the stages i.e. distances and times. Note: speeds at each stage may be available. if so you can use the Average Mean calculation to get a "guesstament" of the average speed in km/hr. Since times are involved, I suggest using the Harmonic Mean calculation to get an average speed in km/hr. Better still, just sent an e-mail to NASA and ask how they calculate average speed for the Rover's trip; (it may be posted on their web site). Sounds like a fun project, please post any results. P.S.: any statistics text will have examples and explanation of these Mean calculations.
 

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