An aircraft heads north at 320 km/h relative to the wind. the wind velocity is 80 km/h from the north. find the velocity of the aircraft relative to ground.

A car of mass 2,000 kg is lifted up a distance of 30 m by a crane in 1 minute. A second crane does the same job in two minutes. What is the work done by two cranes?

 
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Oops! Wrong entry... What do you mean by velocity relative to ground?
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THE VELOCITY IS 320-80=240
 
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