6. Carts A and B move along a horizontal track. The top-view strobe diagram belo

Question

6. Carts A and B move along a horizontal track. The top-view strobe diagram below shows the locations of the carts at instants 1-5, separated by equal time intervals Cart A Cart B 1 cm a. At instant 3 is cart A speeding up, slowing down, or moving with constant speed? Explain. is cart B speeding up, slowing down, or moving with constant speed? Explain b. Is the speed of cart B greater than, less than, or equal to the speed of cart A at instant 2? Explain at instant 3? Explain During a small time interval from just before instant 2 until just after instant 2, does the distance between cart A and cart B increase, decrease, or remain the same? Explain c. Consider the following response to the above question "For the small interval containing instant 2, cart B is ahead and speeding up, so the distance between the carts must be increasing." Do you agree or disagree? Explain. d. Is there any time interval during which cart A and cart B have the same average velocity? If so, identify the interval(s) and explain. If not, explain why not Is there any instant at which cart A and cart B have the same instantaneous velocity? If so, identify the instant(s) (e.g. "at instant 1," or "at an instant between 2 and 3") and explain. If not, explain why not

Explanation / Answer

a)

Cart A is moving at constant speed at instant 3.

Cart B is speeding up at instant 3.

b)

Spped of cart A is greater than that of B at instant 2 and instant 3 as well

c)

Distance between the carts decreases, since B is speeding up and A is at constant speed reaching towards 3

d)

At instant between 4 and 5, both A and B has same average velocity.

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