A vehicle weighing w kg is to run on a circular curve of radius r. If the height of its centre of gravity above the road level is h and the distance between the centres of wheels is 2a, the maximum velocity, in order to avoid over turning, will be

• A. <img src="/_files/images/civil-engineering/applied-mechanics/109-5.129-1.png">
• B. <img src="/_files/images/civil-engineering/applied-mechanics/109-5.129-2.png">
• C. <img src="/_files/images/civil-engineering/applied-mechanics/109-5.129-3.png">
• D. <img src="/_files/images/civil-engineering/applied-mechanics/109-5.129-4.png">