What is the acceleration of a rock thrown straight upward on the way up? At the top of its flight? On the way down?
A. The acceleration of the rock thrown upward has the same value of 7.2 m/s-sq downwards at all three points of the rock on way up, stationary at the top of its flight and on way down. The magnitude and direction of the velocity of the rock will not change but the acceleration will remain different in magnitude and direction.
B. The acceleration of the rock thrown upward has the same value of - 9.8 m/s2 downwards at all three points of the rock on way up, stationary at the top of its flight and on way down. The magnitude and direction of the velocity of the rock will be changing but the acceleration will remain the same in magnitude and direction throughout its trip.
C. The acceleration of the rock thrown downwards has the same value of 5 m/s-sq downwards at all three points of the rock on way up, stationary at the top of its flight and on way down. The magnitude and direction of the velocity of the rock will be changing but the acceleration will remain the same in magnitude and direction throughout its trip.
Answer: B. The acceleration of the rock thrown upward has the same value of - 9.8 m/s2 downwards at all three points of the rock on way up, stationary at the top of its flight and on way down. The magnitude and direction of the velocity of the rock will be changing but the acceleration will remain the same in magnitude and direction throughout its trip.
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