Question

PLEASE HELP!!!!!

Ricky walked away from a mall at a constant velocity for the first 30 seconds. He stopped at an ice cream parlor for 40 seconds. He then turned around and walked toward the mall again at a constant velocity for 10 seconds. He met a friend, and they both walked away from the mall at a constant velocity for the next 20 seconds. Which of the following graphs best represents Ricky's motion?

(choices below)

Answer 1

Ok. so what do we know from the question...
1. for the first 30 seconds he was walking
2. for the next 40 seconds he stoped (did not move anywhere)
3. for the next 10 seconds he began walking again
4. he met a friend (we don't know whether he stoped walking or not)
5. he began walking again for the next 20 seconds.

The graphs you were given show displacement and time: so first go through each graph and check any which had him walking for the first 30 seconds (that is, displacement/distance increased)

Answer 2

Then...Check the following 4 facts we know.
Remember...when he is walking away from the mall displacement will increase but when he is walking away displacement will decrease. The displacement will stay the same when he is not walking anywhere (eg. when he is at the ice cream shop)

Answer 3

sorry..i meant when he is walking towards the mall the displacement will decrease

Answer 4

wait, so is the answer C?

Answer 5

@VintageTypewriter

Answer 6

yep!

Answer 7

thanks :)