A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms^-1. To give an initial upward acceleration of 20 ms^-2, the amount of gas ejected per second to supply the needed thrust will be (g = 1

(a) 127.5 kgs^-1

(b) 187.5 kgs^-1

(c) 185.5 kgs^-1

(d) 137.5 kgs^-1

Kevin Nash , 12 Years ago

Grade upto college level