The 1-lb block A is given an initial velocity v0 = 14 ft/s to the right when it is in the...

The 1-lb block A is given an initial velocity v0 = 14 ft/s to the right when it is in the position θ = 0, causing it to slide up lire smooth circular surface. By using Newton’s second law in terms of polar coordinates, determine the magnitude of the velocity of the block when θ = 60º.