Question

TheP. E and KE of a helicopter flying horizontali, at a hight 400m are in the ratio 5:2.Then velocity of the helicopter is

Answer 1

PE/KE=mgh/mv²/2

5/2=10*400/v²/2

5/2=8000/v²

5v²=16000

v²=16000/5

v=√3200

v=40√2