Physics
If a force acts upon two objects at rest, and having different masses for the same amount of time, then which one of the following will be the same for both the objects?

Kinetic Energy
Momentum
Velocity
Acceleration

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train
Steel can be saved
Accidents due to expansion in summer can be avoided

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