A rocket of initial mass 6000 kg ejects mass at a constant rate of 16 kg/s with a constant relative speed of 11 km/s. What is the acceleration of the rocket a minute after the blast? Neglect gravity.
a) ( 1.5 , m/s² )
b) ( 2.0 , m/s² )
c) ( 2.5 , m/s² )
d) ( 3.0 , m/s² )