A boy throws a ball straight up in the air. After the ball leaves his hand and while it is in the air, which of the following statement is true?A the velocity and acceleration of the ball are always in the same directionB the velocity and acceleration of the ball are always in the opposite directionsC the acceleration of the ball is never zero during the flightD the velocity of the ball is never zero during the flight
Question
A boy throws a ball straight up in the air. After the ball leaves his hand and while it is in the air, which of the following statement is true?A the velocity and acceleration of the ball are always in the same directionB the velocity and acceleration of the ball are always in the opposite directionsC the acceleration of the ball is never zero during the flightD the velocity of the ball is never zero during the flight
Solution
The correct answer is C. The acceleration of the ball is never zero during the flight.
Here's why:
When the boy throws the ball straight up in the air, the ball is acted upon by the force of gravity. This force causes the ball to decelerate on the way up until it reaches its peak height, at which point the velocity is momentarily zero. Then, the ball accelerates on its way down until it reaches the ground.
Throughout this entire process, the acceleration due to gravity is constant and directed downward. Even when the ball is at its peak and the velocity is zero, the acceleration is still acting on the ball. Therefore, the acceleration of the ball is never zero during the flight.
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