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A truck with the mass of 1200 kg travels at a speed(v=90km/hr) then brakes. The brakes get hot and we need the temperature not to

A truck with the mass of 1200 kg travels at a speed(v=90km/hr) then brakes. The brakes get hot and we need the temperature not to exceed 120 degrees celsius. How much mass should the break disks have to not exceed this temperature? The heat capacity of the material of the brakes is 0.47

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