Find the normal reaction between the block and the horizontal surface

Dear Student, 
Force on earth =10 kg×10 (m×g) let g=10ms-2  this is acting vertically upwards to the horizontal plane  (R=W=mg)
force applied in upward direction =50N
therefore normal force acting on block will remain at rest =100N-50N=50N

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For the block to remain in rest normal=50N

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