A block is released from rest and slides down a ramp. The surface of the ramp has three rough sections where the friction between the surface and the block is not negligible, as shown by the shaded regions above. Measuring which of the following will allow for the best estimate of the block's instantaneous acceleration when the block is at the midpoint of the ramp?
A.
The total distance traveled by the block and the total elapsed time
B.
The final speed of the block and the total elapsed time
C.
The distance between points just before and just after the midpoint and the time it takes the block to travel between them
D.
The speed of the block at points just before and just after the midpoint and the time it takes the block to travel between them
Exam No： mistake3 Year：2024 Question No：2
Answer:
B
Knowledge points:
2.1 Systems
2.2 The Gravitational Field 2 7
2.3 Contact Forces
2.4 Newton’s First Law
2.5 Newton’s Third Law and Free-Body Diagrams
2.6 Newton’s Second Law
2.7 Applications of Newton’s Second Law
Solution:
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