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物理 高校生

(1)で、上向きを正とするのに、Va=T0t+(-at)と、-atになるのですか?

24 斜面上での等加速度直線運動② 斜面上の点 0 2.0m/s でボールを転がしたら, ボールは等加速度直 線運動をし,点Oから上方に4.0m離れた 点Qで静止した後,下向きに運動を始めた。 (1) ボールの加速度はいくらか。 (2) 点0から上方に 3.0m離れた点Pを通過する時刻を求めよ。 (3) 点0から下方に12m離れた点を通過する時刻を求めよ。 D 0から,斜面に沿って上向きに速さ 2.0m/s D13 1.0m 3.0m 25 2物体の衝突 斜面上で物体を運動させると, 斜面下向きの加速度α[m/s'] (α>0) をもつ ものとする。斜面上の点Pから, 斜面に 沿って上向きに速さ(m/s] で物体Aを運動 させた。同時に, 点Pより LIm] 離れた点 Qから,物体Bを静かに放す。物体 A, B ともにその後は, 等加速度運動を行った。 (1) 運動を始めてから t(s] 後における, 物体 A, Bの速度はいくらか。斜面に沿っ て上向きを正として答えること。 (2) 運動を始めてから t[s] 後における, 物体 A, Bの変位はいくらか。斜面に沿っ て上向きを正として答えること。 (3) 物体 A, Bが衝突するのは, 運動を始めてから何秒後か。 B V。 013 A L P こん状星雲 みずがめ座にある惑星状星 んだあとに残るガスが星雲と しょうせいうん わくせいじょうせ せいうん

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英語 中学生

分からないので教えて下さい!!!

次の問いの答えとして最も適当なものを、①~①のうちから1つ選べ。 Why couldn't Mr. Black and the children go for a swim one day ? 1 Because they had to go to the lake and look into the water. Because Mr. Black couldn't swim well 読解 問1 読解 3 Jill, Ellen, Bob, and Edward lived near a lake. They could go for a swim every day. A man named Mr. Black lived near the lake, too, Sometimes Mr. Black went Because the lake got dirty with garbage, oil and tires. 3 Because they could not get a boat. One day they asked him to go for a swim with them. Mr. Black said, “We can't o a swim. We may never swwim in the lake again. “Why not ?" asked Edward. swimming with the children. 下線部(ア)について,何をするために彼らは出かけたのか,日本語で答えなさい。 問2 「Because the lake is polluted." said Mr. Black. “There's a new Sign at the lake. h says: No Swimming, Polluted." “What is polluting the lake ?" asked Jill. 明3 下線部(イ) peopleが指すものとして、本文中に書かれていないものを、次の0~ ののうちから1つ選べ。 タイヤを捨てた車の所有者 “Let's go down to the lake and look at it." said Mr. Black. (ア) Mr. Black and the children went to the lake on a sunny Sunday. They looked into the water. It wasn't clean. They walked around the lake and they saw why it wasn't の 2 汚水を流した工場の人々 O 湖の近くに住む人々 clean. 3 油を流したボートの所有者 “Look at that *garbage in the water,” said Jill. “That's what's polluting the lake,” Edward saw oil floating on the water. “That oil pollutes the water, too,” said Edward. “It comes from boats on the lake." 下線部(ウ)について, 人々は何がわかっていたのか、 日本語で答えなさい。 問4 “Come here, " said Ellen. “Take a look at this. There are tires in the lake !" “Why would people throw tires into a lake ?" asked Bob. “They just don't stop to think," said Mr. Black. “But they are not the only ones who pollute the lake. The people who run that factory pollute the water, too." Bob looked at Mr. Black. ““What can we do ? How can we stop the pollution ?” he asked. “Well, we must get help from other people. We can't do it alone,” said Mr. Black. Mr. Black had a firiend who worked for a newspaper company. He asked him to help. The next day, the story about the pollution was reported in the newspaper. Many people read about the story. They talked of the pollution. They talked of ways to clean it up. One day ( People met at the lake. They came to clean it up. They cleaned out the garbage. Then they cleaned out the tires. They set up big cans. Then they put signs on the cans. The signs read, “Put Your Garbage Here.” People who lived near the lake came to help. People who had boats came to help. And, people from the factory also came to help. (ウ) They knew that it would take a long time to get the lake clean again. But they did not give up. They all hoped that someday the “No Swimming" sign would come down and the people could swim in the lake again. 注) garbage=ごみ

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