Author Question: When a rock thrown straight up reaches the exact top of its path, its velocity is A) zero and its ... (Read 73 times)

joblessjake · **on:** Jul 29, 2018

When a rock thrown straight up reaches the exact top of its path, its velocity is

A) zero and its acceleration is zero.
B) zero and its acceleration is 10 m/s2.
C) about 10 m/s and its acceleration is zero.
D) about 10 m/s and its acceleration is 10 m/s2.

Question 2

Regarding the masses of the electron, proton, and neutron:

A) the proton and neutron have roughly the same mass, and both are far more massive than the electron.
B) the proton is the most massive, the electron is far less massive, and the neutron has a mass about midway between the proton and electron mass.
C) the proton and neutron have roughly the same mass, and both are about twice as massive as the electron.
D) the proton is much more massive, while the electron and neutron have roughly the same mass.
E) the proton and electron have roughly the same mass, and both are far more massive than the neutron.