A man can swim through still water 4.2m/s. Suppose this man swims in a river with current 1.3 m/s. Find his average speed over a trip:
a) across the river and back
b) a certain distance downstream and back
The Attempt at a Solution
Here is a diagram I made:
Left side of picture is there, right side is back
So should I solve for x, then take x, multiply by two, then divide by two. Thats the avg speed? because the question doesnt give any distance or time, so this is all I could think of.
b) is this a vector addition question? so his avg speed would be 2.9m/s?