A mass, hung from a spring, oscillates with simple harmonic motion. Which statement is correct?
A .The force on the mass is directly proportional to the angular frequency of
the oscillation.
B .The force on the mass is greatest when the displacement of the bob is
greatest
C The force on the mass is greatest when the speed of the bob is greatest.
D The force on the mass is inversely proportional to the time period of the
oscillation.

b.

explanation:

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in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min