Physics
A particle is thrown vertically upward. When it reaches the highest point, it has

An upward acceleration
A downward velocity
A downward acceleration
A horizontal velocity

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Physics
Holography is a technique of

Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent three dimensional black and white photograph

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