Q. The engine of a jet aircraft applies a thrust force of $10^{5}N$ during take off and causes the plane to attain a velocity of $1\ km/sec$ in $10\ sec$. The mass of the plane is
A) $10^{2}\ kg$
B) $10^{3}\ kg$
C) $10^{4}kg$
D) $10^{5}kg$
Explanation
(b) Acceleration produced in jet $= \frac{Change\ in\ velocity}{Time}$
$a = \frac{(10^{3} - 0)}{10} = 100\ m/s^{2}$
$\therefore Mass = \frac{Force}{Acceleration} = \frac{10^{5}}{10^{2}} = 10^{3}\ kg$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.