x=10cos5t
v=x'=-50sin5t
v max при sin5t=-1 vmax=50
v=1/4 *vmax=50/4=12.5
12.5=-50sin5t
-0.25=sin5t
5t=arcsin(-0.25)
t=1/5*arcsin(-0.25)=2.9 c
x=10cos5t
v=x'=-50sin5t
v max при sin5t=-1 vmax=50
v=1/4 *vmax=50/4=12.5
12.5=-50sin5t
-0.25=sin5t
5t=arcsin(-0.25)
t=1/5*arcsin(-0.25)=2.9 c