Physics: How much work must be done to stop a 1075-kg car traveling at 115 km/h ? Express your answer to two significant figures and include the appropriate units

How much work must be done to stop a 1075-kg

Ответ:

calmicaela12s

19.01.2022

Physics

Work done on the car will be 548440.9463 J

Explanation:

We have given mass of the car m = 1075 kg

As the car finally stops so final velocity of the car v_f=0m/sec

Initial velocity of car u = 115 km/hr $=115\times \frac{5}{18}=31.943m/sec$

Work done is equal to change in kinetic energy

So work done $=\frac{1}{2}mv_f^2-\frac{1}{2}mv_i^2$

= $=\frac{1}{2}m(v_f^2-v_i^2)=\frac{1}{2}\times 1075\times (0^2-31.943^2)=-548440.946J$

As the work done is negative so work is done on the car to stop it .

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Ответ:

Keekee9847

13.05.2023

Physics

Mass and weight are two different things. The unit for mass is a gram. A nickel has the mass of about one gram. Objects that take up space and have mass are called matter.

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How much work must be done to stop a 1075-kg car traveling at 115 km/h ? Express your answer to two significant figures and include the appropriate units

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