Answer to Question #280507 in Physics for Faith

Question

A glider attached to one end of a string oscillates given by the displacement function . What is the velocity of the mass after 1.4 seconds?

Answer 1

Given that the displacement function is $x(t)=A\sin(\omega t),$ the velocity is the first derivative by time:

$$v(t)=\omega A\cos(\omega t)=\omega A\cos(1.4\omega ).$$