Aball dropped from a bridge strikes the water in 5s . calculate (a)the speed with which it strikes and (b) the height of the bridge

How to tell if two objects are in thermal equilibrium 1.the objects have the same temperature 2.the objects are the same size 3.the objects are touching each other 4.the objects temperatures are changing

Aball horizontally thrown from a cliff at 8m/s

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point