Jawaban:

Diketahui :

massa (m) = 50 kg

kecepatan (v) = 4 m/s

s = 10 m

Ditanyakan : gaya perlawanan (F)...?

Jawab :

Mencari percepatan :

begin mathsize 14px style v subscript t squared equals v subscript 0 squared plus 2 a s 0 squared equals 4 squared plus 2 left parenthesis a right parenthesis 10 0 equals 16 plus 20 a minus 16 equals 20 a a equals negative 0 comma 8 space end style

Mencari waktu (t) :

begin mathsize 14px style v subscript t equals v subscript 0 plus a t 0 equals 4 plus left parenthesis negative 0 comma 8 right parenthesis t t equals 5 space s end style

untuk mencari gaya gunakan persamaan Impuls = perubahan momentum

begin mathsize 14px style I equals increment P F. t equals m space left parenthesis v subscript 1 minus v subscript 2 right parenthesis F equals fraction numerator m space left parenthesis v subscript 1 minus v subscript 2 right parenthesis over denominator t end fraction F equals fraction numerator 50 space left parenthesis 4 minus 0 right parenthesis over denominator 5 end fraction F equals 40 space N end style

Jadi, jawaban yang tepat adalah 40 N.space

semoga membantu.