Question

A river $400m$ wide is flowing at a rate of $2.0m/s$. A boat is sailing at a velocity of $10m/s$ with respect to the water, in a direction perpendicular to the river. $\left(a\right)$Find the time taken by the boat to reach the opposite bank. $\left(b\right)$ How far from the point directly opposite to the starting point does the boat reach the opposite bank?

Answer 1

$\left(a\right)$

$y=v_{y}t⟹d=vt$

$⟹t=\frac{400}{10}=40s$

$\left(b\right)$

$x=v_{x}t=ut$

$⟹x=2\times 40=80m$