Objects can have an acceleration, but not be moving. When you are standing still, you are still experiencing the acceleration of gravity.
C is not correct
A stone is thrown straight up. At the top of the path, the net force acting on it is (ignore air resistance)
a) greater than its weight
b) greater than zero, but less than its weight
c) instantaneously equal to zero
d) equal to its weight
At the very top of the path wouldn't a=0 at than instance so F=ma
thus results in a net force of 0 N ? so c) is the correct answer right?
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