Um grupo de amigos reunidos em um clube cria, de brincadeira, uma corrida chamada "Maratônica". Nela, os competidores são obrigados, pelo regulamento, a tomar 100 mililitros de água tônica a cada 300 m corridos, em um percurso de 2,5 km.

O percurso total da maratona no SI é igual a:

a) 300 km

b) 2500 m

c) 2,5 m

d) 2500 km

e) 300 m

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.

atomic = no of protons.

mass number-atomic number = neutron number