Question

physics please solve

Answer 1

Force = mass x acceleration

so we just need to find the acceleration here

we can get acceleration by double differentiating the x(t) so

single differentiating it
v(t) = x'(t)  = p+2qt+3r(t^2)   (t square)
a(t) = v'(t) = 2q+6rt

so Force = mass x (2q+6rt)


so f(t =2) = 2 x (68) = 136 N