SOLUTION: A ball is thrown straight up. What are the velocity and acceleration of the ball at the highest point in its path? A) V = 0, a = 0 B) V = 0, a = 9.8 C) V = 9.8, a = 0 D) V = 9.

Question 1160949: A ball is thrown straight up. What are the velocity and acceleration of the ball at the highest point in its path?
A) V = 0, a = 0 B) V = 0, a = 9.8 C) V = 9.8, a = 0 D) V = 9.8, a = 9.8
Found 2 solutions by solver91311, ikleyn:
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

The only force acting on the projectile after it has been launched is gravity which has a constant acceleration. Given the convention that velocity "up" is positive and "down" is negative, at some point the velocity must be zero -- namely at that instant when the ball is neither going up nor down.

And by the way, NONE of the given answers are correct because none of them have units. Velocity is measured in distance units per time unit and acceleration is measured in distance units per time unit squared. Neither one can be equal to just a number.

John

My calculator said it, I believe it, that settles it

Answer by ikleyn(52788) (Show Source): You can put this solution on YOUR website!
.

At the upper point, the velocity is 0 (at any consistent system of units).

The acceleration of the ball has the constant magnitude of 9.81 m/s^2 (and is directed vertically down) until the ball hits the ground.

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