A50-kg student stands on a scale in an elevator. at the instant the elevator has a downward acceleration of 1.0 m/s2 and an upward velocity of 3.0 m/s, the scale reads approximately(a) 350 n (b) 450 n (c) 500 n (d) 550 n (e) 650 n

Option D) 500 N is correct.

Given :

Mass = 50 Kg

Acceleration =  

Velocity = 3 m/sec

Solution :

F = ma            (from Newton's second law)

N - mg = ma

N = m(g - a)

N = 550 N

Therefore option D) 500 N is correct.

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D-550 N

Explanation:

Given

mass of student=50 kg

at particular instant elevator is moving downward with acceleration of  1 m/s^2

Net weight of man shown by scale will be more than his actual weight as elevator is decelerating

let N be the normal reaction on man thus

and Normal reaction will be shown by scale as apparent weight

increases it

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it