Jana hits the ball so that it moves with an initial velocity 8m/s upwards. The ball starts from 5m above the floor. How fast will the ball be when it reaches the floor?

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?