Question

Хлопчик кинув м'яч у горизонтальному напрямку. Опором повітря можна знехтувати. виберіть правильне твердженняА. Імпульс м'яча перед ударом об землю напрямлений вертикально.Б. Імпульс м'яча під час його руху не змінюється за напрямком.В. Сума потенціальної і кінетичної енергії під час руху м'яча залишається незмінною.Г. Кінетична енергія м'яча під час його руху не змінюється.​

Answer 1

Ответ:

Объяснение:

В. Сума потенціальної і кінетичної енергії під час руху м'яча залишається незмінною.

Answer 2

The question is asking for the correct statement regarding a boy throwing a ball horizontally, disregarding air resistance. Let's analyze each statement and determine which one is correct.

A. The impulse of the ball before hitting the ground is directed vertically. B. The impulse of the ball does not change direction during its motion. C. The sum of the potential and kinetic energy of the ball remains constant during its motion. D. The kinetic energy of the ball does not change during its motion.

To determine the correct statement, let's analyze each option:

A. The impulse of the ball before hitting the ground is directed vertically. - This statement is incorrect. The impulse of the ball before hitting the ground is directed horizontally, as the ball is thrown horizontally. - [[1]]

B. The impulse of the ball does not change direction during its motion. - This statement is correct. The impulse of the ball remains in the same direction throughout its motion, regardless of the presence of air resistance. - [[2]]

C. The sum of the potential and kinetic energy of the ball remains constant during its motion. - This statement is incorrect. The potential and kinetic energy of the ball change during its motion. As the ball moves horizontally, its potential energy decreases while its kinetic energy increases. - [[3]]

D. The kinetic energy of the ball does not change during its motion. - This statement is incorrect. The kinetic energy of the ball changes during its motion. As the ball moves horizontally, its kinetic energy increases. - [[4]]

Therefore, the correct statement is B. The impulse of the ball does not change direction during its motion.

Please let me know if there is anything else I can help you with!