If the equation of transverse wave is \( y = x_0 \cos \left( 2\pi \left( nt - \frac{x}{\lambda} \right) \right) \), the maximum velocity of the particle is twice the wave velocity, if \( k \) is â
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: