A cannon ball has 1000 J of kinetic energy while it is flying through the air. If the velocity of the ball is doubled, then the amount of kinetic energy the cannon ball has would Be the same

Be four times as great

Be twice as great

Be half as great

Ineed with these 2 questions. you.

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

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