To clarify the distinction between speed and velocity, and to review qualitative

Question

To clarify the distinction between speed and velocity, and to review qualitatively one-dimensional kinematics.

A woman stands at the edge of a cliff, holding one ball in each hand. At time t0, she throws one ball straight up with speed v0 and the other straight down, also with speed v0.

For the following questions neglect air resistance. Pay particular attention to whether the answer involves "absolute" quantities that have only magnitude (e.g., speed) or quantities that can have either sign (e.g., velocity). Take upward to be the positive direction.

Part C

Which ball has the greater speed at the instant of release?

Part D

Which ball has the greater average speed during the 1-s interval after release (assuming neither hits the ground during that time)?

Part E

Which ball hits the ground with greater speed?

Explanation / Answer

If the ball that is thrown downward has an acceleration of magnitude at the instant of its release (i.e., when there is no longer any force on the ball due to the woman's hand)
So,a=g

Part C:Neither; the speeds are the same.

Part D:the ball thrown downward

Part E:Neither; the balls hit the ground with the same speed.

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