The linear expansivity of a metal, P is twice that of another metal Q. When these metals are heated through the same temperature change, their increase in length is the same.
Calculate the ratio of the original length of P to that of Q.

2. they have negligible mass.

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.