Is a weight lifter lifting weights converting his work into kinetic energy?

If a hand is swinging a string with a ball attached to the end, is the string doing work on the ball?

Is the work done by a mountain climber’s weight force (weight x distance he climbed along the slope)?

Is a bullet going in the negative x coordinate direction -1/2mv^2 and a bullet going in the positive x coordinate direction +1/2mv^2 ?

Tip and Trik

I’m a beginner at working out at home. I use the weight machines at the gym and I do mostly cardio>

I have a set of dumb bells at home with adjustable weights on them. I’m looking for someone to give me some basic advice regarding sets and reps and specific weights for each set.

I know I could ask the lads in the gym, and I have before it’s just I only want to know one question ya know? When i ask them anything they launch into a big thing, i just wanna know regarding dumb bells. What weight I should use and how many sets and reps.

Cheers, any help is very much obliged.

OBAMA FOR USA