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Help My Project about Electronic Toy Car

Hello~ I feel so pleasure when I find this forum in the internet.

I'm interesting in electronics ,especially in electronic cars. Recently I am involved in a project about electronic toy cars.My professional knowledge is limited. So here I came .
According to the principle of circuit,the electrical machinery--M can be added to full electricity gradually in two seconds.Here some questions made me wonder.Questions:
1).does this circuit have a function of slow start ?
2).Can R2R4 give electricity to C2C3 after opening the switch quickly? Or do you have any suggestions of electrical discharging ?
3).Is it feasible that Q1Q2 in here just use one transistor such as 8050 (this is 8050's datasheet: http://www.kynix.com/uploadfiles/pdf86758/8050++Y1.pdf ).
4).The components in the picture just reckon up simply. Anybody could give me further approximate value so that my circuit experiment can go ahead smoothly ?
5)I want to underline that I have never realized a real electronic circuit before. Well, if you have the similar mature circuit please give me one.

Thank you in advance!

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