While launching a rocket of mass 2×10^4 kg, a force of 5×10^5 N is applied for 20s. Calculate the velocity attained by the rocket at the end of 20s?

Yes, Newton's second law, which states F=ma , is fundamental to calculating a rocket's velocity by first determining its acceleration, then using that acceleration in a kinematic equation (v=u+at)) to find the final velocity. For rockets with changing mass, the more complex Ideal Rocket Equation is needed, derived from the principles of Newton's laws and the conservation of momentum.