A body travelling in a straight line is subjected to a net force F for time t. Later, it is subjected to a force of 2F for time 0.5t. Both forces are colinear with the direction of travel. What can be deduced about the change in velocity and acceleration of the body during the two times it was subjected to net forces?
    Up to what point is stress/strain constant for a spring?
    Beyond which point can a spring no longer return to its original length?
    A satellite travelling at constant speed around the earth in a circular orbit has a net force acting on it. The direction of this force is

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