A model rocket has the (vertical) velocity vs. time graph shown. The rocket is launched from the ground and flies straight up while its engine fires . We have defined the upward direction to be “positive.” a. Circle the time on the graph when the rocket reaches its HIGHEST ALTITUDE.

b. Calculate the highest altitude it reached in the space below, making your method clear.

it becomes positively charged by charging it

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

no

explanation:

no i dont know how to solve this you should probably try to google the answer