Question

care ma poate ajuta dau inima

Answer 1

$v=72\frac{km}{h}=72\cdot\frac{1000m}{3600s}=20\frac{m}{s}$

a) $\Delta t = 10s$
$D=v\cdot\Delta t=20\frac{m}{s}\cdot 10s=\boxed{200m}$

b) $D=25\:km$
$\Delta t=\frac{D}{v}=\frac{25\:km}{72 \frac{km}{h}}=\frac{25}{72}h=\frac{25}{72}\cdot 3600s=\\=\boxed{1250s}$