Examine the three Displacement vs. Time plots shown below. Match the physical si

Question

Examine the three Displacement vs. Time plots shown below. Match the physical situation on the left with one of the plots that best describes it.

Plot A: straight linear increase
Plot B: curved line increase
Plot C: positive line that curves at top and levels off

1. A rock released from rest at some height above the ground.
2. A car moving in a straight line at constant speed.
3. A car moving in a straight line while the driver applies the brakes.
4. A car moving in a straight line while the driver pushes on the accelerator pedal.
5. A jetliner crusing in a straight line at 33,000 feet above ground.
6. A child jumping straight up off the ground and coming back down again.

Explanation / Answer

1. s = 0 + gt2 /2

s t2  

plot B curved line increase

2. s = ut

s t

Plot A straight line increase

3. s = ut - at2 /2

plot C

4. s = ut + at2 /2

plot B

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