7. A ball is thrown straight up. What is its acceleration just before it reaches

Question

7. A ball is thrown straight up. What is its acceleration just before it reaches its highest point? a. zeTo b. slightly less than g c. exactly g d. slightly greater than g 8. Two objects at thrown from the top of a tall building. One is thrown upward and the other is thrown downward, both with the same initial speed. What are their speeds when they hit the street? a. The one thrown up is traveling faster b. The one thrown down is traveling faster. They are traveling at the same speed. d. It is impossible to tell because the height of the building is not given. 9. A brick is dropped from the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks a. The first brick accelerates faster bThe second brick accelerates faster. C. The two bricks accelerate at the same rate. It is impossible to determine from the information given. 10. A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance. Compare the times of fall of the two bullets The fired bullet hits first The dropped bullet hits first c-They hit at the same time. d. Cannot tell without knowing the mass. 11. The acceleration of gravity on the moon is only one-sixth of that on earth. If you hit baseball on the moon with the same speed and angle that you would on earth, the ball would land a the same distance away. b. one-sixth as far 6 times as far 36 times as far. 12. A boy sitting in a railroad car moving at constant velocity throws a ball straight up into the air. Where will the ball fall? a. behind him b. in his hands c. in front of him

Explanation / Answer

(7 ) All the objects moving under the effect of gravity have the acceleration equal to exactly g.so option c is correct.

(12)since the car is moving with constant speed, so the ball will fall inhis hands.so option b is correct.

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