A ball tossed vertically upward reaches its highest point and then falls back to its starting point. During this up-and-down motion the acceleration of the ball is always
A) in the direction of motion.
B) opposite its velocity.
C) directed upward.
D) directed downward.
Answer: D
You might also like to view...
Discuss whether a car speedometer measures instantaneous speed or an average speed
What will be an ideal response?
Which of the following is not true about differences between novae and supernovae?
A) The same star can undergo novae explosions more than once, but can undergo only a single supernova. B) Supernovae eject gas into space, but novae do not. C) Novae occur only in binary star systems, while supernovae can occur both among single stars and among binary star systems. D) Novae are much less luminous than supernovae.
What is meant by an adiabatic surface?
What will be an ideal response?
A student plays on a see-saw with her experimental android robot, Robby. The student has a weight of 300 N and is seated 2.8 m from the axis of rotation. Robby balances her when he is seated 0.7 m from the axis. Robby's weight is
A. 667 N. B. 1200 N. C. 500 N. D. 725 N. E. 1000 N.