A block of mass M placed inside a box descends vertically with acceleration 'a'.
The block exerts a force equal to one-fourth of its weight on the floor of the box.
The value of 'a' will be
FBD wrt ground frame
Hence correct option is 3
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50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pKb of ammonia solution is 4.75, the pH of the mixture will be : Option: 1 3.75 Option: 2 4.75
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