Question

A force of $40N$ acts on a body.If the units of mass and length are doubled and the unit of time is tripled then the force in the new system becomes

• A. $90N$
• B. $90newunits$
• C. $\frac{160}{9}newunits$
• D. $\frac{160}{9}N$

Answer 1

The correct option is B $90newunits$

New unit is given by,

$=40\times \frac{\frac{1}{2}\times \frac{1}{2}}{{\left(\frac{1}{3}\right)}^2}$

$=90$ new units