Physics
A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be ________

30 J
40 J
20 J
50 J

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Physics
Lightning is produced when

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

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Physics
Air moves from the region where the air ________

Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high
Pressure is high to the region where the pressure is low
Humidity is high to the region where the humidity is low

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