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Q.

In vacuum all freely falling bodies


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a

have the same speed

b

have the same velocity

c

have the same force

d

have the same acceleration 

answer is D.

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Detailed Solution

In a vacuum, all free-falling objects have the same acceleration.
This is not the case when an object passes through the earth's atmosphere. This is because the buoyant force acts on a lighter object and reduces its acceleration.
In a vacuum, all falling objects have the same acceleration.
The constant acceleration is due to the earth's gravity and is called gravitational acceleration given by:
g=GMR2Where,
G= gravity Constant =6.67×10-11Nm2 kg-2
M= Earth’s mass
R= radius of the earth
From the above, we can see that all variables in the equation are constant. g is, therefore, constant, independent of other factors.
 
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