A particle is hurled into air from a point on the horizontal ground at an angle with the vertical. If the air exerts a constant resistive force

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at the highest point, the velocity of projectile is horizontal

the time of ascent will be equal to time of descent

the total energy of the projectile is not conserved

the path of projectile will be parabolic path

answer is A, C, D.

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Detailed Solution

Since the resistive force offered by air is constant , the resultant of air drag and gravity force acting on the particle is also constant which means acceleration of the particle is also constant .Also the angle between the velocity of projection and acceleration is not $0^{0} o r 180^{0} .$ Hence the path of projectile is a parabolic path.

Due to air friction, the energy spent by projectile against air friction is not conserved, so the total energy of projectile is not conserved.

At the highest point, the projectile has horizontal component velocity only.

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