26. At a certain instant of time the mass of a rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (taking g = 10 m/s ^2
(a) 20m/s 2 (b) 10m/s 2
(c) 2 m/s 2 (d) 1 m/s 2
Ans. b
(23)