Three forces given by vectors $2 \hat{i} + 2 \hat{j}$,$2 \hat{i} - 2 \hat{j}$,and $-4 \hat{i}$ are acting together on a point object at rest. The object moves along the direction:

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

$A$ body of mass $2 \, kg$ is sliding with a constant velocity of $4 \, m/s$ on a frictionless horizontal table. The force required to keep the body moving with the same velocity is .......... $N$.

We are standing in a bus moving with constant velocity. When brakes are applied to the bus,we are thrown in the forward direction. Why?

For ordinary terrestrial experiments,the observer in an inertial frame in the following cases is

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.)