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Q.

Figure shows the velocity-displacement curve for an object moving along a straight line. At which of the points marked is the object speeding up?

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a

2

b

1

c

1,2, and 3

d

1 and 3

answer is A.

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Detailed Solution

Froma=vdv/ds, we can find the sign of acceleration at various points. V is positive for all three points 1, 2 and 3. dv/ds is positive for point 1, zero for point 2 , negative for point 3.
 So, only for point 1, velocity and acceleration have same sign, so the object is speeding up at point 1 only

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