A block slides down a frictionless incline making an angle θ with the floor at an elevator. The elevator is descending with an acceleration a. The value of normal reaction acting on the block is
mgsinθ
m(g-a)cosθ
mgcosθ
m(g-a)sinθ
The forces acting on the block are graviational force and the normal force.
N + M cos θ = mg cos θ
Therefore the normal force can be written as
N = mgcosθ − macosθ
= m(g – a)cosθ
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