ME AJUDE NESSA QUESTAO DE M.U.V. URGENTE!!!!!!!!.... Pergunta de ideia deatsn

March 2022 1 15 Report

ME AJUDE NESSA QUESTAO DE M.U.V. URGENTE!!!!!!!!

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Olá, Atsn.

$v_A=v_{0A}+at\Rightarrow 15=30+a\cdot4\Rightarrow-4a=15\Rightarrow a=-\frac{15}4\,m/s^2$

$
v_A^2=v_{0A}^2+2a\Delta s_A\Rightarrow15^2=30^2-2\cdot\frac{15}4\cdot\Delta s_A\Rightarrow225=900-\frac{15}2\cdot\Delta s_A\Rightarrow$

$\frac{15}2\cdot\Delta s_A=675\Rightarrow \Delta s_A=\frac{1350}{15}=90\,m$

$\Delta s_A=s_A-s_{0A}\Rightarrow90=s_A-0\Rightarrow s_A=90\,m$

$s_B=s_{0B}+v_Bt\Rightarrow s_B=32+15\cdot4=32+60=92\,m$

$\boxed{s_B-s_A=92-90=2\,m}$

Resposta: letra "b"

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