Question

A block of mass 1 kg is placed on a rough wedge
which is fixed on an elevator moving upward with
constant velocity 2 m/s. The block m is at rest
w.rt. wedge. Net reaction force on the block is
2 m/s
IM
300
(1) 5N
(3) 7.5 N
(2) 10 N
(4) 12 N​

Answer 1

answer : net reaction force acting on block = 10N

explanation : as you mentioned , A block of mass 1 kg is placed on a rough wedge is fixed on elevator moving upward with constant velocity 2m/s.

so, weight of block applied on wedge = mg = 1kg × 10m/s² = 10N

from Newton's 3rd law ,

action and reaction are of equal in magnitude and directed in opposite directions.

so, weight of block applied on wedge = net reaction force acting on the block by wedge

or, 10 N = net reaction force acting on the block by wedge .

hence, net reaction on the block is 10N

Answer 2

easily calculate the normal reaction which is net reaction force