Which statements are true about mass and or density if your on utp and it wants you to pick more then one the right ones are

a balloon inflated with air has less mass then a marble

a marble has more density then a balloon inflated with air

if two balls are placed in a tank of water, the one with more density will sink faster

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it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

higher potential

explanation:

because it is in a high speed so it must move into a of high potential