A ball is thrown horizontally from the top of a 20-m high hill. It strikes the ground at an angle of 45 degrees (below horizontal). With what speed was it thrown?

The summit of chimborazo, in ecuador, which is at a distance of about 6,384 km from the earth’s center. the bottom of the mariana trench, in the western pacific ocean, which is nearly 6,370 km from the center of the earth. on the surface of earth on the equator line.

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

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.