Acyclist is riding along at a constant velocity of 15 m/s. he then accelerates at a uniform rate of 0.50 m/s2 over a distance of 64 m. how long did he accelerate for?

Cyclist will take 4 seconds to travel 64 meter.

Explanation:

 We have equation of motion, , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

 In this case initial velocity = 15 m/s, acceleration = 0.50 , we need to calculate time when displacement = 64 meter.

 Substituting

 t = 4 seconds or t = -64 seconds(which is not possible).

So he will take 4 seconds to travel 64 meter.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.