Arock dropped from a 20 meter bridge falls into the river below. how long did it take to reach the water? what velocity did it hit the water with.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Determine the maximum r-value of the polar equation r =3+3 cos 0