How do i find the approximate velocity of "the object", on the graph at 5 seconds?

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?

What are two examples of phase changes that skip a phase during transition?

How does the motion of an airplane compare to the motion of a rocket ?