一道物理题,AP预备的...加速度是向下的,有一个不变的比例为0.15g

一道物理题,AP预备的...加速度是向下的,有一个不变的比例为0.15g
Suppose the elevator now accelerates down-
ward at a constant rate of 0.15 g.
What is the ratio of the new scale reading
to the value W of the scale reading when the
elevator is at rest?
1.
Fscale
W
= 2.0
2.
Fscale
W
= 0.85
3.
Fscale
W
= 1.0
4.
Fscale
W
= 1.15
5.
Fscale
W
= 1.85
6.
Fscale
W
= 2.15
7.
Fscale
W
= 0.15