That's very dependent on the strength of the cyclist and the type of bicycle used.
Race BMXers are probably the fastest to reach their top speed, but track sprinters have a higher top speed. The way humans work and the way bicycles work means that full acceleration from standstill is rarely used, as a gear that makes for a good start will also mean a low top speed. And a gear that makes for a good top speed will make the bike sluggish at the start. Having a bike with multiple gears tends not to help that much, as very few shifting systems will work particularly well when shifting under full Power.
Either by the help of a downwards slope and gravity, or by the rider pedalling harder. Or possibly by encountering a strong tailwind.
A.) They accelerate by there bones and your heart. If your heart is fast you will be fast, if your heart is slow you will go slow.
Really fast
Pedal as fast and as hard as you can in an appropriate gear.
run fast
acceleration
If you sit on it, you push downward. The bicycle seat naturally pushes back up - if this wasn't the case, you would accelerate downward, due to the force of gravity.
Accelerate around the corners
45mph
Force is directly proportional to mass. Therefore, even both the car and bicycle are being accelerated to the same velocity, accelerating a car would require more force since it has a greater mass.
That's about 22.8223mph. This is a fairly fast rate for a bicycle, but a bit slow for a car.
0 to 87 in about 12 seconds
You twice it.