Q. A rocket with a lift-off mass $10^{5}$ kg is blasted upward with an initial acceleration of $5\ ms^{- 2}$. If $g = 10\ ms^{- 2}$, then the initial thrust of the blast is
A) $1.5 \times 10^{2}\ $N
B) $1.5 \times 10^{3}\ $N
C) $1.5 \times 10^{5}\ $N
D) $1.5 \times 10^{6}\ $N
Explanation
(d) Initial thrust $mg + ma = m(g + a)$
$= 10^{5}(10 + 5)$N
$= 1'5 \times 10^{5}$N $= 1.5 \times 10^{6}\ $N
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.