Q. A rocket with a lift-off mass $3.5 \times 10^{4}\ kg$ is blasted upwards with an initial acceleration of $10\ m/s^{2}$. Then the initial thrust of the blast is
A) $1.75 \times 10^{5}\ N$
B) $3.5\ \times 10^{5}N$
C) $7.0\ \times 10^{5}\ N$
D) $14.0\ \times 10^{5}\ N$
Explanation
(c) Initial thrust must be
$m\lbrack g + a\rbrack = 3.5 \times 10^{4}(10 + 10) = 7 \times 10^{5}\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.