$A$ body is thrown up in a lift with a velocity $u$ relative to the lift,and the time of flight is found to be $t$. The acceleration with which the lift is moving up is:
- A$\frac{2u - gt}{t}$
- B$\frac{2u + gt}{t}$
- C$\frac{u - gt}{t}$
- D$\frac{u + gt}{t}$
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