A child throws a baseball directly upward.What are the signs of the velocity and

Question

A child throws a baseball directly upward.What are the signs of the velocity and acceleration of the ballimmediately after the ball leaves the child's hand? Enter the correct sign for theelevator's velocity and the correct sign for the elevator'sacceleration, separated by a comma. For example, if you think thatthe velocity is positive and the acceleration is negative, then youwould enter +,- . If you think that both are zero, thenyou would enter 0,0 . A child throws a baseball directly upward.What are the signs of the velocity and acceleration of the ballimmediately after the ball leaves the child's hand? Enter the correct sign for theelevator's velocity and the correct sign for the elevator'sacceleration, separated by a comma. For example, if you think thatthe velocity is positive and the acceleration is negative, then youwould enter +,- . If you think that both are zero, thenyou would enter 0,0 .

Explanation / Answer

part A: the lift is moving down, so velocity is downward (-) the lift is stopping this kind of movement, by applying a force inthe other direction: braking. Braking is a negative acceleration,but since the y-axis is upward it should be positive (+) Basically: If something brakes, the acceleration is the oppositesign of the velocity part B: the ball is starting it's move up, so velocity is upward (+) the ball is being slowed down, because of gravity and friction. Theball will start to move slower immediately after releasing it, soit is kind of 'braking'. So the acceleration is downward (-) part C: the ball is not moving upwards nor downwards when it is at it'stop. So there is no velocity (0) the ball will still be attracted by gravity, so there is a downwardacceleration (-)

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