Question

In a new system of units 40kg be the unit of mass 10km be the unit of length and 1 min be the unit of time. Then 1 joule is equal to=?

Answer 1

"This is much famous formula. We know that

1 joule = 1kg * (m/s) ^2

If

Unit of mass =10 kg

Unit of length=10 m

Unit of time = 1 minute = 60 sec

Then

1 joule = 10 kg * (10m/60sec) ^ 2

1 joule = 10/36 kg* (m/sec) ^ 2

Then finally

1joule=0.277kg*(m/sec) ^ 2

Hence, this is the right answer."