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# Physics help: boat crossing a river calculation Watch

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1. Any help would be appreciated. I have answers to (a) and (b), not sure about (c) but tbh not 100% on all

*PIC BELOW*
2. thanks!
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3. a) I assume it means the resultant speed from both, as the two speeds (boat and river) are perpendicular you can use pythagoras to find the resultant of the two.
b) As the two speeds are perpendicular you only worry about the 1.5ms-1 towards the other bank, using speed = distance/time you can find the time taken.
c) Using your time for b) and a speed of 0.9, how far would it travel once it has reached the other side of the river?

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Updated: October 11, 2016
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