A person of weight 50 kg is moving down in an elevator Calculate downward acceleration offered by the elevator whose reaction force is 400 N on the surface .

Explanation

Given
Weight = 50 kg
To find : Acceleration , a=? (downward)
Reaction , R= 400 N
Solution
`R=m(g-a)`
`400 = 50 (10-a)`
`400= 500-50 a `
`500 =500 - 400`
`50 a= 100`
`a=(100)/(50)`
Downward acceleration , `a= 20 ms^(-1)`