Air Resistance and chapter five review

Today in school, we had a sub. We corrected falling and Air Resistance and chapter five review. Here is the answers for the two work sheets.

Falling and Air Resistance
1.most
2.a,b
3.d,e
4.still downward
5.c,f
6.c,f
7.c
8. greater
a.10 m/s²
b.6 m/s²
c.0 m/s²
d.-2 m/s²
e.-10 m/s²
f.0 m/s²

Chapter 5 Review

1.a=f/m
20n/70kg=.286 m/s²

2.m=f/a
m=125n/25m/s²=5.0kg

3.d=(v1+v2/2)t
v2=133 m/s
a=v/t
a=133/3=44.4m/s²
f=ma
f=500kg x 44.3m/s²=22150n

4.d=(v1+v2/2)t
t=2xd/v2
t=0.083s
a=v/t
a=(12 m/s)/0.083
a=144 m/s²
f=ma
f=1.0kgx144 m/s²=144n

5.a=f/m
a=-40.0/75=-0.53 m/s²

6.fg=mg
fg=68kgx9.8n/kg
fg=-670n
next scribe is Shasta