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:

Acceleration
Momentum
Velocity
Kinetic energy

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Physics
Lightning is produced when

Strong opposite charges in different clouds break down the resistance offered by the intervening air
Water vapour produces electricity in the clouds
Similar charges of electricity rush towards each other and then get repelled
Clouds strike against impurities in air and the friction burns up these impurities

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Physics
The bats can fly in the dark because

They have weak legs and are likely to be attacked by predators
They generate flashes of light
They can see the objects in darkness
They generate ultrasonic sound waves

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