http://i46.tinypic.com/34xgy8o.png
The question was screencapped as it has a graph as well.
A) The x-acceleration is ..... zero at 58 sec .
B) The speed at 10 sec is ..... the speed at 64 sec.
C) At 46 sec, the speed is as high as it gets.
D) The x-acceleration is ..... zero at 70 sec .
E) The speed is ..... zero at 29 sec.
I don't know what I got wrong. I answered first time: G,G, T, G, E and then second time E G G T G E
The question was screencapped as it has a graph as well.
A) The x-acceleration is ..... zero at 58 sec .
B) The speed at 10 sec is ..... the speed at 64 sec.
C) At 46 sec, the speed is as high as it gets.
D) The x-acceleration is ..... zero at 70 sec .
E) The speed is ..... zero at 29 sec.
I don't know what I got wrong. I answered first time: G,G, T, G, E and then second time E G G T G E
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Your 2nd set of answers has 6 letters (E G G T G E) but there are only 5 questions!
________________
A) L. The speed is the gradient (slope). At 58s the gradient is reducing meaning that the car is slowing down. This means a negative acceleration so the answer is 'less than zero'.
B) G. Because the gradient is greater at 10s than at 64s.
C) T. Because this is the steepest part of the graph.
D) E. Because the graph is straight at 70s, the velocity is constant (so acceleration equals zero).
E) E. Because the gradient is zero (the distance isn't changing, so the car must have stopped).
LGTEE
________________
A) L. The speed is the gradient (slope). At 58s the gradient is reducing meaning that the car is slowing down. This means a negative acceleration so the answer is 'less than zero'.
B) G. Because the gradient is greater at 10s than at 64s.
C) T. Because this is the steepest part of the graph.
D) E. Because the graph is straight at 70s, the velocity is constant (so acceleration equals zero).
E) E. Because the gradient is zero (the distance isn't changing, so the car must have stopped).
LGTEE