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A projectile is projected in x -y plane ...

A projectile is projected in x -y plane with velocity `v_(0)` . At top most point of its trajectory projectile explodes into two identical fragments.Both the fragments land simultaneously on ground and stick there.Take point of projection as origin and R as range of projectile if explosion had not taken place.Which of the following cannot be position vectors of two pieces when they land on ground.
a) `(R/2)hati`,`((3R)/2)hati`
b)0`hati`,2R`hati`
c) R`hati`-R`hatk`, R`hati`+R`hatk`
d) 2`Rhati`+`(R/2)hatk`, `Rhati`-`(R/2)hatk`

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