問7

           初速度の単位変換

\(v_0\ =\ 36\)km/h

\(=\ 36\frac{km}{h}\times\frac{1000m}{3600s}\)

\(=10\)m/s

 

\(v^2-{v_0}^2\ =\ 2ax\)より、

\(a =\ \frac{v^2-{v_0}^2}{2x}\)

=\(\frac{0\ -\ {10}^2}{2\ \times\ 5}\)

\(=-10\)m/s^2