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O forta F = 62N actioneaza timp de t=10 s asupra unui corp de masa m de[lasandu-l o distanta x=310m, daca miscarea se efectueaza fara frecare masa corpului este:
a)10kg
b)5kg
c)25kg
d)15kg


Răspuns :

Vectorial:F+G+N=ma

Scalar:Ox:F=ma

Oy:N-mg=0

a=F/m

d=vm*t

vm=v/2

d=vt/2

a=Δv/Δt=v/t=>v=at

d=at²/2=Ft²/2m<=>310=62*100/2m<=>310m=3100=>m=3100/310=10 kg=>m=10 kg