Answer
(a) When the car accelerates from rest, the balloon will move backwards since the balloon will have a tendency to continue in its state of rest but the car accelerates leaving behind the balloon and the balloon is supported only by the thread at the child's hand.
(b) When the car brakes to stop, the balloon will move forward.
Work Step by Step
(a) When the car accelerates from rest, the balloon will move backwards since the balloon will have a tendency to continue in its state of rest but the car accelerates leaving behind the balloon and the balloon is supported only by the thread at the child's hand.
(b) When the car brakes to stop, the balloon will move forward.