2. D
= .
20
= 0,5 .
= 10 ( )
3. C
Massa (kg) Laju (m/s) = .
a 48 25 1200
=
b 50 10 500
=
c 100 25
=
d 100 12 1200
=
e 120 10 1200
=
4. D
∆ = ( − )
1
2
30 20
∆ = 0,25 ൬− − ൰
50
∆ = 0,25 ൬− ൰
∆ = 12,5 ( )
5. D
′
+ = ( + )
2 2
1 1
2
1
20 0
′
0,15 . + 0,1 ൬− ൰ = (0,15 + 0,1 )
47