1.

The height of the building is `50ft`. The same in millimetre isA. `560mm`B. `285mm`C. `1786.8mm`D. `15240 mm`

Answer» (d) `n_(1)u_(1)=n_(2)u_(2)`
`:. n_(2)=(n_(1)u_(1))/(u_(2))implies(50 ft)/(mm) =(50xx12xx2.54cm)/(0.1cm)=15240mm`
`:. 50ft=15240mm`


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