A person sitting in a carriage at rest pushes it from within. Will the carriage move ?

A passenger sitting in a car at rest pushes it from within. Will the car move ?

A passenger sitting in a car at rest, pushes the car from within. The car doesn't move, why?

Some of the Passengers sitting in a stationary carriage push it from inside. Give reason whether carriage will move or not ?

A second's pendulum is taken in a carriage. Find the period of oscillation when the carriage move s with an acceleration of 4 ms^(-2) (i) vertically upwards (ii) vertically downwards, and (iii) in a horizontal direction.

A second pendulum is takin in a carriage. Find the period of oscillation when the carriage moves with an acceleration of 4*2ms^(-2) (i) vertically upwards (ii) vertically downwards and (ii) in a horizontal direction.

Is it possible, for a person sitting inside a car at rest, to make the car move by pushing it from inside?

A railway carriage of mass 9,000 kg moving with a speed of 36 km h^-1 strikes a stationary carriage of same mass. After the collision, the carriages get coupled and move together. what is their common speed after collision? Is the collision elastic?