You throw a ball straight up. As the ball is going up, the direction of the velocity and acceleration point __________.
Fill in the blank(s) with correct word
Question 2
Why does the nuclear force have a short range?
a. Because the exchanged particles have nonzero mass, and thus limited time before they can complete the exchange.
b. Because the low mass of the exchange particles means their exchange is effective only over short distances.
c. Because the exchange particles have zero mass and thus limited time before they can complete the exchange.
d. Because the exchanged particles must travel long distances to complete the exchange.
e. Because it is the weakest of the four forces.
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