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Q.

A body is projected at 300 with the horizontal. The air offers resistance in proportion to the velocity of the body. Which of the following statements is correct?

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a

The trajectory is a symmetrical parabola

b

The time of rise to the maximum height is equal to the time of return to the ground

c

The velocity at the highest pint is directed along the horizontal

d

The sum of the kinetic and potential energies remains constant

answer is C.

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Detailed Solution

The upward motion is with higher retardation while the downward motion is with lesser acceleration. Further, the time of rise is less than the time of return. A part of the kinetic energy is used against friction.
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