Question

# In a new system, unit of mass is 10kg, unit of length is 5m and unit of time is 10s. Then in the new system 5N is equal to :

A
5 new units
B
10 new units
C
15 new units
D
20 new units

Solution

## The correct option is D 10 new unitsForce $$= M^{1}L^{1}T^{-2}$$$$f_{1}=5\dfrac{kg m}{s^{2}}$$$$f_{2}=\dfrac{10 kg\times 5 mt}{10^{2}}$$$$\dfrac{f_{1}}{f_{2}}=\dfrac{5}{\dfrac{10\times 5}{10^{2}}}=10$$ new unitsPhysics

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