You toss a ball straight upward, in the positive direction. The ball falls freely under the influence of gravity. At the highest point in the ball’s motion,
A. its velocity is zero and its acceleration is zero.
B. its velocity is zero and its acceleration is positive (upward).
C. its velocity is zero and its acceleration is negative (downward).
D. its velocity is positive (upward) and its acceleration is zero.
E. its velocity is positive (upward) and its acceleration is zero.

What is the fate of the electrons that interact with a specimen in an electron microscope?

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?