A river flows from south to north at 5.4 km/hr. on the west bank of this river, a boat launches and travels perpendicular to the
1 answer:
The motion of the boat is basically a uniform motion on both directions, north-south (NS) and east-west (EW), with two constant velocities: 
and 
.
From the law of motion on the EW direction we can find the total time of the motion:
since we know
, we find
and then, we can find how far the boat went on the NS direction during this time:
From the law of motion on the EW direction we can find the total time of the motion:
since we know
and then, we can find how far the boat went on the NS direction during this time:
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Answer:
0 J
Explanation:
From the diagram below; we would notice that the Force (F) = Tension (T)
Also the angle θ adjacent to the perpendicular line = 90 °
The Workdone W = F. d
W = Fd cos θ
W = Fd cos 90°
W = Fd (0)
W = 0 J
Hence the force is perpendicular to the direction of displacement and the net work done in a circular motion in one complete revolution is = 0
