A bullet of mass 0.05 kg moving with vel...

A bullet of mass 0.05 kg moving with velocity 400 m/s gets embedded after collision with a block of mass 3.95 kg placed on a smooth horizontal platform as shown in the figure. If height of the platform from the ground is 20 m and block strikes the ground at B, then the value of AB is
(Take g = 10 m/`s^2`)

5 m

20 m

15 m

10 m

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