In the circuit shown below, the AC source has voltage \(V=20\cos(\omega t)\,\text{V}\) with \(\omega=2000\,\text{rad/s}\). The amplitude of the current will be nearest to:
A particle is moving in a straight line. The variation of position $ x $ as a function of time $ t $ is given as: $ x = t^3 - 6t^2 + 20t + 15 $. The velocity of the body when its acceleration becomes zero is: