Weight-Power Relation?

I vote this as "Most Confusing Engineering Question" I have faced in my life.....

This one might be even more confused.pc control car

all you require on your shaft is a pully of diameter 1000mm and a rope over the pulley drawing the given weight upward at a constant speed . . . then decide the speed of ascent and the distance through which you wish to raise the weight . . . assume about 2% losses in the mechanical system . . . the motor efficiency can be over 90% . . . if the required speed of ascent is too fast then consider a smaller diameter for the pulley . . perform a few calculations and you will be able to select a motor easily . . .

By taking some training in the subject of Physics?

No motor required, all you need is a deep well, position the 3.5kg weight over it and let go. It will drive itself. For better effect, you can go after it and measure many parameters....

What do you do at the university ? this is a question for a much lower level.

Do a search on "motor acceleration formula". You know the mass of the load, next you need the know the acceleration rate to determine peak torque requirements and you will need to know the speed you want to spin at to determine a preliminary motor size, determine the mass of that motor rotor and make sure you don't need to increase the motor power rating for the total mass. Or hire someone who already knows how to do this.

try, applied mathematics / mechanics, dear anish (there's a hole in my bucket....)

It's should be very simple when you look at simple laws of motion etc

it is same for my pc controlled car project..here i am using electric dc motor to drive my wheels...total weight of my car will be 3.5kg approx. and motor speed will be 60 rpm...now i want to know that what watt power of motor should be needed to drag that load????