if a man in an elevator drops his briefcase but it doesnot fall to the floor,what can you conclude about the elevators motion?
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yes elevator is freely falling under the gravity.
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Answer:
Let m be mass of briefcase, R be reactionary force and a be acceleration of lift. Then,
R= mg- ma= m(g-a)
according to question, it doesn't fall that means reactionary force is 0. R=0.
m(g-a)=0 m cant be zero so,
(g-a) must be zero.
g-a=0
g=a
so, we can conclude that the lift is falling with the acceleration of g. Then the briefcase is in free fall condition. Hence, it is weight less.
Explanation:
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