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## Sagot :

acceleration is the rate of change of velocity

the speed has increased from 5 m/s to 7.5 m/s over a period of 1.25 s

the formula to calculate acceleration is as follows

[tex] a = \frac{v-u}{t} [/tex]

where a - acceleration

u - initial velocity

v - final velocity

t - time

substituting the values in the equation

[tex] a = \frac{7.5 m/s - 5.0 m/s}{1.25 s} = \frac{2.5}{1.25} = 2 [/tex]

acceleration is 2 m/s²