tolong bantu soal fisika tentang kinematika

yg pertama
a=12t²

V=$adt
=$12t²
=4t³......t=2s

4[2]³ = 4.8 =32 m/s

X=Xo+$vdt
=1+$4t³
=1+t⁴...... t=2s

X=1+[2]⁴
=1+16
=17 m

v=66/2 =33m/s

no 3.

A. V=3.7-0.1 / 3-1 =3.6/2 =1,8 m/s

b. V=12,5-0,8/5-2=11,7/3= 3,9 m/s