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Answer :
That amount of thermal energy generated by the friction when the car cost of the hill is 200937.1 Joules.
The mass of the car is 710 kg and it is running with a initial speed of 112km/h(31.11m/s) it is observed two coast up a hill and stops at a height of 20.5 m from the starting point.
The amount of thermal energy generated by the friction will be equal to the laws in energy due to the friction which will be given by the relation,
1/2Mv² = Mgh + Thermal energy
Where,
M is the mass of car,
v is speed of car and h is the height of the coast and g is the gravitation acceleration.
Putting values,
1/2(710)(31.11)² = 710(9.8)(20.5) + Thermal energy
Thermal energy = 200937 Joules.
So, thermal energy generated is equal to 200937.1 Joules.
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