$A$ stone tied to a string is rotated in a circle. If the string is cut,the stone flies away from the circle because

An object is moving with a constant speed along a straight-line path. $A$ force is not required to

$A$ 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?

What was the mistake in Aristotle's idea regarding motion?

We are standing in a stationary bus. When the bus suddenly starts,why are we thrown in the backward direction?

An astronaut accidentally gets separated from his small spaceship accelerating in interstellar space at a constant rate of $100 \; m/s^2$. What is the acceleration of the astronaut the instant after he is outside the spaceship (in $; m/s^2$)? (Assume that there are no nearby stars to exert gravitational force on him.)