Question

a body of mass 50kg is hung by a spring balance in a lift.Calculate the reading of the balance when (1)the lift is ascending with an acceleration of 2m/s (2)the lift is descending with a constant velocity of 2m/s (3) the lift is descending with an acceleration of 2m/s

Answer 1

Case 1-

W=m(g+a)

=50*(10+2)

=600N

=60Kg

Case 2-

W=mg

=50*10

=500N

=50Kg

Case 3-

W=m(g-a)

=50*(10-2)

=400N

=40Kg