yes. But it's probably better just to say 146.5 km/hr
the numbers are not so big as to need scientific notation, and they were all defined with one decimal place of accuracy.
A train travels due east at a velocity of 85.5 km/hr. A passenger walks from the front of the train to the back at a velocity of 3.7 km/hr. What is the velocity of the passenger to an observer who is seated on a train going due west at a velocity of 64.7 km/hr?
What I've done so far:
I found the total distance east of the passenger on train one, which I think is 85.5-3.7, so the passenger on train 1 is going 81.8 km/hr.
I think the final step is to add this distance (81.8) to the other train's distance (64.7) to find the relative velocity. Adding these together gave me 1.5 * 10^2 (significant figures). Is this the proper way to go about this answer?
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