the object has 40 kg of mass. if it move with acceleration 2.5m/s2. find the force is needed to stop this object

KELAS            = 8
PELAJARAN   = FISIKA
KATEGORI      = HUKUM NEWTON
KATA KUNCI   = force, acceleration, mass

ANSWER :
massa = m = 40 kg
a = 2,5 m/s²
Question : Force (F)

Force :
F = m x a
   = 40 x 2,5
   = 100 N