<span>Vo</span><span>=54км/ч=15м/с</span>
<span>t=3c</span>
<span>V=0</span>
<span>a-? S-?</span>
<span>V=Vo-at, Vo=at, a=Vo/t, a=15/3=5м/с2</span>
<span>S</span><span>=</span><span>Vot</span><span>-</span><span>at</span><span>2</span><span>/2, </span><span>S</span><span>=15</span><span>м/с</span><span>*3</span><span>с</span><span>- 5</span><span>м/с2</span><span>*9</span><span>с2</span><span>/2=22,5м</span>
Fт=gm,g=9,8Н/кг
Fт=10*4=40Н
m=Fт/g
m=2000/10=200кг
I=0.08A
Решение в приложении.
∧=u*T
T=∧/u
T=144/22≈6.54
∧-длина волны
u-скорость волны
T-период колебаний