D.
A more accurate answer would be -50 m/s. 50 m/s is the change in speed.
You could solve it by analyzing the points by graphing them on a coordinate plane
If Gold's natural state has a definite shape and a definite volume, then its natural state is solid.
You can use Le Chatelier's Principle to describe the equilibrium shift.
Le Chaterlier's Principle states that: "<span>If a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change."
Thus, if you heat up the reaction, the equilibrium shift favors the endothermic reaction. If you increase pressure (if gases are involved), the shift favors the reaction that produces less gaseous products (to counteract pressure) and so on.</span>
