While launching a rocket of mass 2xx10^(4) kg, a force of 5xx10^(5)N is applied for 20s. What is the velocity attained by the rocket at the end of 20s?

While launching a rocket of mass 2xx10^(4) kg, a force of 5xx10^(5)N i

1.	While launching a rocket of mass 2xx10^(4) kg, a force of 5xx10^(5)N is applied for 20s. What is the velocity attained by the rocket at the end of 20s?
Answer» 300m/s 350 m/s 450 m/s 500 m/s Solution :Impulse = Change in momentum `therefore F XX t= m(V-u), " where " u=0` `5XX10^(5) xx 20 = 2XX10^(4) xx v` `thereforev= (100xx10^(5))/(2xx10^(4))= 500m//s`