Question

a cheetah accelerates from 15 m/s to 30 m/s in 3.0s what is the cheetahs acceleration

Answer 1

acceleration=increasement of velocity/time
acc=30-15/3
acceleration=15/3
acceleration=5m

Answer 2

acceleration is defined as rate of change in velocity

so here we can write it as

$a = \frac{dv}{dt}$

$v_i = 15m/s$

$v_f = 30 m/s$

$\Delta t = 3 s$

now using the above equation

$a = \frac{30 - 15}{3}$

$a = 5 m/s^2$

so acceleration of cheetah will be 5 m/s^2