A spring balance is attached to the ceiling of a lift. When the lift is at rest spring balance reads 49 N of a body hang on it. If the lift moves : (i) Downward (ii) upward, with an acceleration of 5ms^(-2). (iii) with a constant velocity. What will be the reading of the balance in each case ?

A spring balance is attached to the ceiling of a lift. When the lift i

1.	A spring balance is attached to the ceiling of a lift. When the lift is at rest spring balance reads 49 N of a body hang on it. If the lift moves : (i) Downward (ii) upward, with an acceleration of 5ms^(-2). (iii) with a constant velocity. What will be the reading of the balance in each case ?
Answer» SOLUTION :(i) `R=m(g-a)` weight =49N so `m=(49)/(9.8) =5kg ` R=5(9.8-5) R=24N (ii) R=m(g+a) R=5(9.8+5) R=74N (III) as a=0 so R=mg =49N