Question

In which case, the stairs exert push force on a person?
(A) While climbing up the staircase
(B) While climbing down the staircase
(C) While standing on the staircase
(D) Both A and B
(E) All the above​

Answer 1

Answer:

the answer is only and only A

Answer 2

Answer:

it's A

Explanation:

because u need to push yourself up