Block A has no relative motion with respect to wedge fixed to the lift as shown in figure during motion-2. Then,

a) Work done by gravity in motion 1 is zero $\left({\text{θ=90}}^{\text{0}}\right)$  and in motion 2 is negative  $\left({\text{θ=180}}^{\text{0}}\right)$
b) In both cases angle between N and S is acute.
c) and d) : Depending on the value of acceleration in motion 1, friction may act up the plane or down the plane. Therefore angle between friction and displacement may be obtuse or acute. So, work done by friction may be negative or positive.