A piece of cork starts from rest at the bottom of a lake and floats up. Its velocity v is plotted against time t. Which of the following best represents the resulting curve?

A piece of cork starts from rest at the bottom of a lake and floats up

1.	A piece of cork starts from rest at the bottom of a lake and floats up. Its velocity v is plotted against time t. Which of the following best represents the resulting curve?
Answer» Correct Answer - A As the cork moves up, the force due to buoyancy remains constant. As its speed increases, the retardig force due to viscosity increases, being proportional to the speed. Thus the acceleration gradually decreases.

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A piece of cork starts from rest at the bottom of a lake and floats up. Its velocity v is plotted against time t. Which of the following best represents the resulting curve?

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