Physical independence of force is a consequence of

$A$ person is sitting in a travelling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is

An athlete does not come to rest immediately after crossing the winning line due to the

When a bus suddenly takes a turn,the passengers are thrown outwards because of

$A$ reference frame attached to the Earth cannot be an inertial frame because

$A$ trolley of mass $300 \; kg$ carrying a sandbag of $25 \; kg$ is moving uniformly with a speed of $27 \; km/h$ on a frictionless track. After a while,sand starts leaking out of a hole on the floor of the trolley at the rate of $0.05 \; kg \cdot s^{-1}$. What is the speed (in $km/h$) of the trolley after the entire sandbag is empty?