A 770 kg car moving at 21 ms brakes to a stop. the brakes, Ask an Expert

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Q. A 770 kg car moving at 21 m/s brakes to a stop. The brakes contain about 15 kg of iron, which absorbs the energy. What is the increase in temperature of the brakes?

Q. An object has a kinetic energy of 302 J and a momentum of magnitude 28.9 kg·m/s. Find the speed and the mass of the object.

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Category:- Physics
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