If a body of mass m is carried by a lift moving with an upward acceleration a, then the forces acting on the body are (i) the reaction R on the floor of the lift upwards (ii) the weight \(mg\) of the body acting vertically downwards. The equation of motion will be given by
1
\(R = mg - ma\)
2
\(R = mg + ma\)
3
\(R = ma - mg\)
4
\(R = mg \times ma\)