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The definition of acceleration

Acceleration is the rate of change of velocity as a function of time.

For example a car traveling at 50 km/hr starts to accelerate, 10 seconds after, its speed changes to 100 km/hr then the acceleration of the car during the time can be calculated as below:

initial speed = 50 km/hr

final speed = 100 km/hr

the change of speed = 100 - 50 = 50km/hr

time = 10 seconds = 1/360 hr

thus the acceleration = (50km/hr) / (1/360 hr) = 18000 km/ hour2 = 1.38 m/ s2

the formula I am using here is: a = (v2 - v1)/t

where,

a: acceleration

v1: initial speed

v2: final speed

t: time