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9.A 5000 kg rocket is set for vertical firing. Theexhaust speed is 800 ms1. To give an initialupward acceleration of 20 ms-2, the amount ofgas ejected per second to supply the neededthrust will be (g = 10 ms-2)(1) 127.5 kgs-1(3) 185.5 kgs-(2) 187.5 kgs-1(4) 137.5 kgsing with 300 ms-

Answer»

Mass of rocket(M)= 5000 kg

Exhaust speed(v)=800m/s^2

Acceleration(a)=20m/s^2

acceleration due to gravity (g)=10 m/s^2

F=m(g+a)=5000(10+20)=15000N

amount of gas ejected per second= F/v=15000/800=187.5 kg/s



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