Physics
What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

35 km/sec
21 km/sec
18 km/sec
11.2 km/sec

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Physics
RADAR is used for:

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

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