10. assess a child pushes down on a box
lid with a force of 25 n. at the same
time, her friend pushes down on the lid
with a force of 30 n. the spring on the
box lid pushes upward with a force of
60 n. can the children close the box?
why or why not?

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

true is the correct answer

hope i