How to derive the formula w = m×g ​

W=mxg is derived by f=mxa

where f-force

m=mass

a=acceleration

due to gravity when the object fall down due to gravity it becomes f=mxg

as we need to find the weight of the object we need put w (weight) in the place of f (force) so it become

w=mxg

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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