A particle moving at a velocity of 5.1 m/s in the positive r direction is given an accel-
eration of 4.9 m/s² in the positive y direction
for 1.8 s.
What is the final speed of the particle?

the answer would be 32*f

probably not if net force is zero

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

answer///terminator or twilight zone;