Q.

A body is in translatory equilibrium if 


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a

resultant force on it is zero

b

it is at rest

c

it is in uniform motion 

d

All the above 

answer is D.

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Detailed Solution

A body is in translatory equilibrium if
       The resultant force on it is zero
       It is at rest
       It is in uniform motion
Translational equilibrium: “A mass or an object is in translational equilibrium when the sum of all the external forces acting on the object equals zero. It means an object is in translational equilibrium when overall acceleration is zero”. Therefore, it is either not moving or moving at a constant velocity.
When a body is at translatory equilibrium, the net force acting on a body is zero. This is because the body's centre of mass remains either at rest or moves rectilinearly with constant velocity when the body is in translatory equilibrium. Hence, the body is certainly in a uniform motion or at rest.
 
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