阅读短文，根据其内容回答问题。
Many people have jobs. They go to work nearly every day. Some people are lucky. Either they have
very interesting jobs or they make a lot of money Most people are not so lucky. Either their jobs are not
very interesting or they don't make much money.
The most interesting jobs are often the most difficult. People take a long time to learn how to do them.
Doctors study for at least six years after finishing school.
Some young people have interesting and high-pay jobs. Many young players do their work successfully.
Football and tennis stars are usually under 35 years old. Older people usually can not play these sports very
well. They cannot move fast enough. Golf, however, is a good sport for older people. Many golf players
are quite old, but they can play it successfully.
Most people work until they are 60 or 65 years old. Then they retire (退休) and have a lot of free time.
Some people never retire though. These people usually have very interesting jobs Writers, artists, scientists
and actors (演员) usually work until they die. Their work is their life.
1．Do most people have interesting and high-pay jobs?
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2．Why do some jobs have to be taken a long time to learn?
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3．What sports are young people good at?
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4．Why is golf a good sport for older people?
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5．When do some people who have interesting jobs retire?
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=5.0m/s，v2=
=7.0m/s
=0.12m/s2 
，得：v5=11m/s
=0.22A