tlong bantu no 2 penting bgt soalnya

a = 20 cm/s2
s = 2,5 m = 250 cm
t = ..... s

a = v ÷ t
a = (s/t) ÷ t
a = s/(t^2)
t^2 = s/a
t^2 = 250/20
t^2 = 25/2
t = 5/(akar 2)
t = 5(akar 2)/2