Предмет: Физика, автор: kulishelya

Стрілу випустили вертикально вгору з початковою швидкістю 50 м/с.Скільки часу стріла піднімалася?Яка загальна тривалість польоту? ПОВНЕ РОЗВ'ЯЗАННЯ ЗАДАЧІ З ДАНО БУДЬ ЛАСКА ​

Ответы

Автор ответа: onetfriend
4

Ответ:

5 секунд полет вверх, 10 секунд полное время полета

Объяснение:

Дано

v0 = 50 м/с

g = 10 м/с² - ускорение свободного падения

Найти t общ

Стрела летит вверх пока ее скорость v не станет равной 0 и ее полет описан уравнением:

v=v0-g*t

где v0 - начальная скорость, g -ускорение свободного падения (g=10 м/с²), t - время полета до верхней точки.

Подставляем данные:

0 = 50 - 10 * t

50 = 10 * t

t = 50 / 10

t = 5 с (время полета до верхней точки)

на спуск стрелы будет затрачено такое же время, тогда общее время полета t общ = 2t = 2*5 = 10 c

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1.2 Present Simple

1 Complete the sentences with the correct form of the verbs in brackets.

0 Liam likes reading fantasy books. (like) 1 Becky ___plays____________ (play) video games in her free time.

2 Becky _______________ (have) a party at the weekend.

3 Becky _______________ (watch) videos on her computer.

4 Becky _______________ (go) shopping with her best friend.

5 Becky _______________ (relax) in front of the telly.

__ /5

2 Complete the sentences with the correct form of the verb play.

I 0 play (+) the guitar in a school band but I 1_______________ (–) the drums because I'm not good at it. My brother Bob 2____________ __________ (–) a musical instrument but he 3_______________ (+) sports. He is really great! My sisters, Anne and Kate, 4__________ 2 Complete the sentences with the correct form of the verb play.

I 0 play (+) the guitar in a school band but I 1_______________ (–) the drums because I'm not good at it. My brother Bob 2____________ __________ (–) a musical instrument but he 3_______________ (+) sports. He is really great! My sisters, Anne and Kate, 4__________

__ /5

GRAMMAR QUIZ 1.2 ● GROUP B

3 Put the words in capitals in the correct place in the sentences.

0 I go to school on Saturday. NEVER

I never go to school on Saturday.

1 They visit their friends in the afternoon. ALWAYS

___________________________________ ___________________________________ 2 We go to the cinema at the weekend. USUALLY

___________________________________ ___________________________________ 3 My mum is at home on Saturday mornings. OFTEN

___________________________________ ___________________________________ 4 I listen to music on the bus. SOMETIMES ___________________________________ ___________________________________ 5 Tim is late for school. NEVER

___________________________________ ___________________________________