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?

Velocity
Momentum
Acceleration
Kinetic Energy

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

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

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