A rocket with a lift-off mass of 20,000 kg is blasted upwards with an initial acceleration of 5.0 m/

Question

A rocket with a lift-off mass of 20,000 kg is blasted upwards with an initial acceleration of 5.0 m/s². Calculate the initial thrust (force) of the blast. (Take g = 10 m/s²)

Professor PC Thomas Classes · Answer

Net upward force $F_{net} = 	ext{Thrust} - mg = ma$. Thrust = $m(g + a) = 20000 	imes (10 + 5) = 20000 	imes 15 = 300,000$ N = $3.0 	imes 10^5$ N.