In a new system unit of force is 50N, unit of velocity is 5 m/s and unit of frequency is 2 Hz then choose the correct statement(s) :

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New units: force = 50 N, velocity = 5 m/s, frequency = 2 Hz.

Time: unit of time = $\frac{1}{f} = \frac{1}{2} s = 0.5 s$ . (A) is correct, (D) is wrong.

Length: $v = \frac{L}{T}$ , so unit of length = $5 \times 0.5 = 2.5 m$ . (B) is correct.

Mass: $F = M L T^{- 2}$ , so unit of mass = $\frac{F T ^{2}}{L} = \frac{50 \times ( 0.5 ) ^{2}}{2.5} = 5 kg$ . (C) is correct.

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