Given a force of 100 N and an acceleration of 5 m/s2, what is the mass

Could someone me find the answer to this problem.

What is the measurement of how fast an object moves relative to a reference point?

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?