A passanger, seated in a train is at rest with reference to __________

A passenger at rest on a flatbed train car fires a bullet straight up. The event is viewed by observers at rest on the station platform as the train moves past the platform with constant velocity. What is the trajectory of the bullet as described by the observers on the platform?

A simple pendulum suspended from the ceiling of a trans has a time period T when the train is at rest. If the train is accelerating uniformly at a then its time period

A body is weighed with a spring balance in a train at rest, shown a weight W . When the train begins to move with a velocity upsilon around the equator from west to east and if the angular velocity of the train is omega then the weight shown by spring balance is

A pendulum suspended from the ceiling of the train has a time period of two seconds when the train is at rest, then the time period of the pendulum, if the train accelerates 10 m//s^(2) will be (g=10m//s^(2))

A goods train of 50m. long is moving with speed 54 km/h. A man is sitting in a passanger train which is moving with 18 km/hr. with same direction. In how many second the goods train crosses the man sitting in a passanger train ?