Answer:
t = 5.75 sec.
Step-by-step explanation:
A river has a width of 23m. A row boat has a velocity of 4m/s on still water.
The river flows with a velocity of 6m/s.
find:
Calculate the time taken for the boat to cross the river.
a b
========================================
| /
| / Vr = 6m/s
| / 23m
| /
boat v = 4m/s
========================================
vertical motion:
X = V.t
where X is the width of the river = 23m
V is the speed of the boat with respect to river = 4m/s
t is the time trip it takes.
plug in values into the formula:
23m = 4 m/s * t
t = 5.75 sec.
therefore, the time it takes for the boat to cross the river is 5.75 seconds