12. A baseball player throws a baseball straight up into the air, the ball leav

Physics
Tutor: None Selected Time limit: 1 Day

12. A baseball player throws a baseball straight up into the air, the ball leaving his hand at time t = 0.0 s. The ball reaches maximum height at t = 1.4 s. When will the baseball return to the height from which it was released?

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13. The acceleration of an object is zero. Which best describes the possible motion of the object?

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May 18th, 2015

12. Since the time of flight of the baseball follows a parabolic curve, the time of the ball to return to the height from which it was is exactly the same as the time for the ball to reach maximum height, so

1.4 + 1.4 = 2.8 s

13.  If the acceleration of the object is zero, then the object is moving at a constant speed.

May 18th, 2015

number 13.... is moving at a constant speed or slowing down, or constant speed but may be changing direction?

May 18th, 2015

For the acceleration to be zero, it means the velocity is NOT changing. So the possibilities are, it is standing still, it is moving at a constant speed, or it is at the exact point of changing directions which is the same as momentarily standing still.

May 18th, 2015

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