IOM 2018, Блиц, английски — Задача 76

OLYMPIAD OF METROPOLISES. Moscow, September 3 · 3 септември 2018 г.

Условие

A flying shell has exploded into two fragments which flew apart at an angle $\alpha = 60^{\circ}$. One fragment has a mass of $m_1 = 20$ kg and a velocity of $v_1 = 100$ m/s. The other one has a mass $m_2 = 80$ kg and a velocity of $v_2 = 25$ m/s. What is the energy (in kJ) released by the projectile explosion?

The answer should be given in the SI units unless otherwise stated. If the numerical result turns out to be an integer, it should be given as the answer. Otherwise round the result to the first decimal. $g = 10\ \mathrm{m/s^2}$.

Отговори

Решение

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Оригинал в Архива: blitz.pdf · официални решения: blitz-answers.pdf