5. Which of the following concerning the motion of a body of constant mass under a constant force is incorrect?
A. The acceleration is constant.
B. The body will always travel in a straight line.
C. The slope of the velocity - time graph is a constant.
D. If initial velocity is zero, the distance covered will be proportional to the square of the time.
can you give an explanation?
2 mc about mechanics
2007-08-14 12:18 am
回答 (1)
2007-08-14 1:38 am
✔ 最佳答案
B. The body will always travel in a straight line. <-- IncorrectA = correct because F=Ma , F= constant, M = constant, a also = constant
C = correct , u can imagine the graph , it will be a straight line , (V1-V2)/ t = a
D = correct , because . S=ut + 0.5at^2 , S=0.5at^2 , S proportional to t^2
B = incorrect , the above statement can be applied in circular motion
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