Question
Shown are several curves. Explain with reason, which ones amongst them can be possible trajectories traced by a projectile (neglect air friction). 
✓
Answer
The trajectory of a projectile under gravitational force of earth is a conic section or parabolic or elliptical or its part whose focus must be the centre of the earth. Only (c) option amongst the given curves show the centre of the earth as the focus of trajectory.
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