My scooter can go from 0 to 25m/s in only 4.0s . what is the acceleration of the scooter ? ?

Acceleration = (change in speed) / (time for the change)

Change in speed = (speed at the end) minus (speed at the beginning)

For your scooter . . .

Change in speed = (25 m/s) - (0) = 25 m/s

Time for the change = 4.0 seconds

Acceleration = (25 m/s) / (4.0 s)

Acceleration = (25/4) (m / s·s)

Acceleration = 6.25 m/s²

That's the acceleration the SCOOTER is capable of.  The next question is: Are YOU capable of that much acceleration, or do you go tumbling off the back ?

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr