Who was the first scientist to measure speed as distance over time?

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?

Uwill get answer it brainliest will be awarded for →calculate the pressure exerted by a body having a mass of 30kg over an area of contact 400cm2.also explain it for every step there should be