## Mechanics

 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?answer1. The magnitude of the changes in velocity are equal sinceimpulse = Ft = m(delta v) is the same and m is constanti.e. Ft = 2F x 0.5t2. Acceleration in the 2nd episode is twice the acceleration in the first since a = F/m3. The direction of acceleration is unknown Up to what point is stress/strain constant for a spring?answerThe limit of proportionality Beyond which point can a spring no longer return to its original length?answerThe elastic limit 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 isanswertowards the center of the earth.Also, since the force is always perpendicular to the direction of travel, speed does not change.However, the direction of travel changes constantly.

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