A train is moving with velocity $20m/s$. On this, dust is falling at the rate of $50kg/min$. The extra force required to move this train with constant velocity will be (in $N$)

Q. Sand falls vertically at the rate of $2kg/s$ on a conveyor belt moving horizontally with a velocity of $0.2ms$.
The extra force required to keep the belt moving is

Q. A train is moving eastwards with a velocity of $10m/s$. On a parallel track another train passes with a velocity of $15m/s$ eastwards. To the passengers in the second train, the first train will appear to be moving with a velocity.

Q. A body of mass $5kg$ is moving with a constant velocity of $18$ $m/s$ on a friction less horizontal surface. The force required to keep this body moving with the same velocity is

Q. A goods train moves steadily on a level track with a velocity 108 kmph. Snow falls vertically on to it, and accumulates at a constant rate of $10kg{s}^{-1}$. The additional power required in order to maintain the trains speed despite the snow is:

Q. An object of mass $2kg$ moving with constant velocity $10\hat{i}m/s$ seen in a frame moving with constant velocity $10\hat{i}m/s$. What will be the value of 'pseudo force' acting on object in this frame.