a person stands on a scale inside an elevator at rest. the scale reads 700 n.
a) what is the persons mass?

b) the elevator accelerates upward momentarily at the rate of 1.5 m/s squared. what does the scale read then?

c) the elevator than moves with a steady (uniform) speed of 4 m/s. what does the scale read?

a) The mass of the person, m = 71.43 kg

b) The scale reading when elevator has an acceleration, W = 807.15 N

c) The scale reading when elevator has constant speed, W = 700 N

Explanation:

Given data,

The weight of the person inside the elevator, W = 700 N

The upward acceleration of elevator, a = 1.5 m/s²

The uniform speed of the elevator, v = 4 m/s

a) The mass of the person,

                            m = W /g

                                = 700 N / 9.8 m/s²

                                = 71.43 kg

b) The weight of the person,

                          W = mg + ma

                               = 700 N + 71.43 kg x 1.5 m/s²

                              = 807.15 N

c) When the speed is constant,

                           W = mg

                               = 700 N

The scale reading when the velocity is constant, W = 700 N

1 the 4 is sig

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this