Physics
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same:

Momentum
Acceleration
Kinetic energy
Velocity

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Physics
Ice is packed in saw dust because

Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust is poor conductor of heat.

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