An object of mass m travels along the parabola y = x2 with a constant speed of 10 units/sec. what is the force on the object due to its acceleration at (0,0)? at (21/2, 2) write your answer is terms of i and j. (remember f=ma)

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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