How much work does a motor do as it lifts a 675-kilogram elevator from a height of 15 meters to a height of 35 meters?

How would doubling the made of an object change the objects potential energy

What occurs during a combustion reaction

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?