Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. the elevator takes 3.0s to brake to a stop at the first floor.
a. what is zach's apparent weight before the elevator startsbraking ?
b. what is zach's apparent wight while the elevator is braking?

784.8 Newton

1051.2 Newton

Explanation:

If the elevator is going down at a constant velocity then acceleration is zero and the apparent weight before braking is 784.8 N

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s²

While the elevator is braking it has acceleration -3.33 m/s².

The apparent weight of Zach would be 1051.2 Newton

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is

prndulum needs thread, weight clock to time swings