9. Find the instantaneous velocity of the particle described in Figure P2.1 at the following times:
(a)t = 1.0 s, (b)t = 3.0 s, (c)t = 4.5 s, and (d)t = 7.5 s. calculate

come closer and become far apart and become steam/gas

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

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

i think the answer is tomato juice? not entirely sure though