A runner runs 2km in 5min in the positive direction and then takes 10min to walk back in the negative direction to his initial point.Q1:What is the average velocity for the time spent walking?Q2:What is the average velocity for the first 5 minutes?

A runner runs 2km in 5min in the positive direction and then takes 10min to walk back in the negative direction to his initial point.Q1:What is the average velocity for the time spent walking?Q2:What is the average velocity for the first 5 minutes? 改错 Our science project looks well.My brother is a fast runner.He runs fastly.Amy writes neat in her notebook his brother is a runner.he ___every morning.a 、run b 、runs badly fast high He is a good runner.He runs very---------(填上面的单词) He is a good runner .He likes ____.A.run B.runs C.runner D.running并写出理由!回答后有悬赏 i think it runs ____ a speed of 100km/h.A.in B.at C.away running是什么意思?用在什么地方?说说啦,和runner有什么不同?如这个问题该选什么？：His brother is a______.He_____everg morning.A:running;run B:running:runsC:runner;run D:runner:runs Have you ever taken part in a .阅读理解Have you ever taken part in a marathon?A marathon is 42 km long.It is the longest race in the world.To make the runner’s body work,harder training is quite necessary.A runner should start to prepare for a A dog runs in the sun. Sandra Clark is a _____ star.A.runSandra Clark is a _____ star.A.run B.running C.runner D.runs as a competitive marathon runner,one should have ( )long runs to prepare for the event.a.normal b.regular c.usual d.common 英语选择题（2道,要原因）With the help pg computers,we can do some work______.A>easy B.easily2.The runner ______Liu Xiang is known as the best runner in China.LIu Xiang____the best runner in China.A.is called; is called B.called;called C.is l．The runner's determination to finish ____ him when he runs long races．A） withstands B） maintains C） delays D） sustains2．Is it necessary that Tony ____ the examination in English?A） takes B） has to take C） must take D） take3． Liu Xiang ,a good runner ,is serious _____runningA.of B.about C.at D.in He is a fast runner.He ( )100metres in 11seconds In Japan,traffic____the left.A.Keeps toB.goesC.movesD.runs I have a lot of old coins.改为I have() old coins.That is a big bird.改为That () is () .I have no brothers.改为I () have () brothers.She runs very fast.改为She is a very () runner. 英译中2句This gird in the row stands for betting on a particular horse which runs at the first place.This gird in the column stands for betting on a particular horse which runs at the second place.