Q. A train is moving with velocity $20\ m/sec$. On this dust is falling at the rate of $50\ kg/minute$. The extra force required to move this train with constant velocity will be
A) $16.66\ N$
B) $1000\ N$
C) $166.6\ N$
D) $1200\ N$
Explanation
(a) $F = u\left( \frac{dm}{dt} \right) = 20 \times \frac{50}{60} = 16.66\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.