The power of a motor is $1600$ watt. If the unit of mass is doubled and units of length and time are halved, the power of the motor in new system is:

Q. Force acting on a particle is $10\text{N}$. If units of length and time are doubled and the unit of mass is halved, then find the numerical value of force in the new system of units.

Q. If the unit of mass is doubled, and the units of length and time are halved, how much is 20 N of force in new units? $(1N=1kgm{s}^{-2})$

Q. Certain amount of energy is measured as 400 units. If the fundamental units of length, mass and time, each are doubled the magnitude of the same energy in the new system will be ___units.