r = 3t² + 3t + 2 hit: a. posisi pd saat t= 3 dtk b. posisi pd saat t= 2 dtk c. perubahan posisi pd saat 2&3 dtk

a) t2 = 3 s —> r2 = 3.3² + 3.3 + 2 = 38 m
b) t1 = 2 s —> r1 = 3.2² + 3.2 + 2 = 20 m
c) Δr = r2 - r1 = 38 - 20 = 18 m