Pandora, it is actually a really easy question!

But, first of all, I think you have typed it wrongly that acceleration is 2m per second square, NOT PER SECOND. Check it out in your book!!

Regarding the answers:

b) When the lift accelerates upwards, a net upward force is required to accelerate the lift. The force R exerted by the lift floor is greater than our weight MG, right? Therefore, the net force is R-mg=ma

Thus, weight of the women=mg=60kg x 10 m per second square=600N

Then,

R-mg=ma

R-600N=60kg x 2m per second square

R=720N

Therefore, the reading of the scale is 72kg!!!

C)much more easy, The reading = the mass of women = 60kg!!!

d.) As I have mentioned in B, it have a similar equation mg-R=ma Since when the lift accelerates downwards, a net downward force is required. The force R exerted by the lift floor is less than our weight mg.

R-600N=70kg x -3m per second square

R=390N

Therefore the reading will be 39kg!!

That's easy!

Hopes it can help!

PS Actually, I am a grade10 students in Hong Kong, ( a city of China ) and your question help me revise the stuff!! Thanks anyway. When I compared your question to my question here, I found that my question is actually 10 times more harder!!