现在的航空母舰上都有帮助飞机起飞的弹射系统,已知某飞机在跑道

现在的航空母舰上都有帮助飞机起飞的弹射系统,已知某飞机在跑道上加速时产生的加速度为,起飞速度为50m/s。若该飞机滑行100m时起飞,则弹射系统必须使飞机具有的初速度为(  )

A30m/s                    B40m/s                     C20m/s                    D10m/s

答案

B

【详解】

设应用弹射系统帮助起飞时飞机初速度为,由公式,可得

故选B

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