An aeroplane flying horizontally at a height of 2500m above the ground is observed at an elevation of 60°.After 15 seconds, the elevation is observed to be 30°.Find the speed of the aeroplane in km per hour.
An aeroplane flying horizontally at a height of 2500m above the ground is observed at an elevation of 60°.After 14 seconds,the elevation is observed to be 30°.Find the speed of the aeroplane in km per hour.
A ladder leans against a wall making an angle of 45°with the ground.It reaches (√3-√2)m higher when the angle with the ground is made 60°.How long is the ladder?
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