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  1. Why are double tyres provided at the rear wheels of atruck?

https://www.meritnation.com/ask-answer/question/why-the-rear-side-of-a-truck-is-provided-with-double-wheel/science/5309496

You may refer to the link posted above. Please get back to us if you still have a doubt.

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We know that Pressure is inversely proportional to area.

So, smaller area will exert more pressure, and hence as a truck is a heavy vehicle it is provided with double tyres so that the pressure exerted by it on the ground is less.

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