In case (a), a 5-lb ball is released from rest at position 1 and falls to position 2. In c...

In case (a), a 5-lb ball is released from rest at position 1 and falls to position 2. In case (b), the ball is released from rest at position l and swings to position 2. For each case, use the principle of work and energy to determine the magnitude of the ball’s velocity at position 2. [In case (b), notice that the force exerted on the ball by the string is perpendicular to the ball’s path.]