The motorcyclist in Figure wants to jump over "N" cars of height "h" and width "d". To do this, he will use an inclined ramp (´ that does not have friction) at an angle "α" and of height "H". The motorcyclist enters the ramp with a speed "v0" and climbs it without accelerating (since he cannot, due to the absence of friction). You are asked to calculate the minimum speed with which the motorcyclist must enter the ramp, if he wishes to jump over 14 cars arranged as shown in the Figure. The numerical values for the variables are: h = 1 m H = 12 m α = 45◦ d = 2 m

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

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle