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Shown are several curves (fig. (a), (b),...

 Shown are several curves (fig. (a), (b), (c), (d), (e), (f)). Explain with reason, which ones amongst them can be possible trajectories traced by a projectile (neglect air friction).

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`implies` The trajectory of a particle under gravitational force of the earth will be a conic section (for motion outside the earth) with the centre of the earth as a focus. Only (c) meets this requirement.
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