Physics: Acar has a kinetic energy of 1.9 × 10^3 joules. if the velocity of the car is decreased by half, what is its kinetic energy?

Acar has a kinetic energy of 1.9 × 10^3 joules. - id191031381575, rosepetals2938

Ответ:

fatherbamboo

14.03.2022

The initial kinetic energy of the car is
$E_1 = \frac{1}{2}mv_1^2 = 1.9 \cdot 10^3 J$

Then, the velocity of the car is decreased by half: $v_2 = \frac{v_1}{2}$
so, the new kinetic energy is
$E_2 = \frac{1}{2}mv_2 ^2 = \frac{1}{2} m ( \frac{v_1}{2} )^2= \frac{1}{2}m \frac{v_1^2}{4}= \frac{E_1}{4}$
So, the new kinetic energy is 1/4 of the initial kinetic energy of the car. Numerically:
$E_2 = \frac{1.9 \cdot 10^3 J}{4}=475 J$

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Ответ:

taniyawalker123

25.04.2021

Physics

Explanation:

porfa respondan

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Acar has a kinetic energy of 1.9 × 10^3 joules. if the velocity of the car is decreased by half, what is its kinetic energy?

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