The first supersonic flight was in 1947. It was just above the speed of sound. Which altitude would you expect Captain Yeager to have used for his flight? Sea level
1,000m
13,700m (within altitude used by commercial planes today)
85,000m (where meteor showers originate)

What are the factors that affect the resistance of a wire?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass