Answer:
The magnitude of the velocity of boat w.r.t ground is 6.2015 m/s
Solution:
As per the question;
Width of the river, w = 216 m
Uniform speed of boat due east, 
Angle in north west direction, 
Velocity of the boat relative to water, 
Now,
Velocity of the boat relative to the water is given by:


Also, velocity of water w.r.t ground is 
Now,
Magnitude of the velocity of boat w.r.t ground is given by:




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It's an electric motor that converts electric energy into Mechanical energy
Cause: sewage dumped in rivers,disease spread, and industrial waste dumped into rivers
Effect: fish die off, destroyed habitats, oil spills on land that mixes with run off
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