Physics
For a body moving with uniform acceleration its final velocity equals ________

Average velocity - initial velocity
2 x average velocity - initial velocity
Average velocity + initial velocity
2 x average velocity + initial velocity

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Physics
RADAR is used for:

receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.
locating geostationary satellites.
locating submerged submarines.

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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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