题干

一物体做平抛运动,从抛出点算起,1秒末其水平分速度与竖直分速度大小相等,经5秒钟落地,若取g=10m/s2,则物体在                                                                                       (   )

A:第一、二、三秒内速度的变化量是相等的

B:第一、二、三秒内位移之比是1:3:5

C:后一秒内的位移比前一秒内的位移多gT2=10m

D:落地时的水平位移是30m

上一题 下一题 0.0难度 选择题 更新时间:2019-07-28 03:37:19

答案(点此获取答案解析)

A

同类题5

根据短文内容,从短文后所给的六个选项(A、B、C、D、E和F)中选出能填入空白处的最佳选项。选项中有一项为多余选项。

       ____ Education should be aimed to make better citizens instead of making money. Money can be earned by starting business. It's time to abolish(废除) the industrialized education so that all the people can benefit from real education.

      ____ Concrete(具体的) measures should be taken to lessen(减轻) the students' heavy burden. Not empty talks but concrete and solid policies can guarantee(保证) all the students grow soundly.

        ____ My parents are farmer-turned workers. I think we should be treated equally with the local children. We should have equal chance to go to both the local public schools and take the national college entrance exam rather than go back to our native places.

       ____ School choice has become a serious educational problem. To solve this problem, we must stick to the balanced development. The government should offer more support to weak schools and exchange teachers among all the schools.

        ____ The government's unwillingness to spend enough money on education makes key schools turn to parents for money to build new buildings and increase teachers' income, widening the gap between key schools and common schools. Therefore, in order to realize the balance of education, the government should offer more help to weak schools.

A. Offer more aid to weak schools.

B. Children should share the same educational rights.

C. Heavy load is supposed to be taken off the students' shoulders.

D. Bring the industrial management of education to an end.

E. Balanced education may stop school choice.

F. Key schools and classes are unreasonable.