Answer:
i had trouble with this one but it A
Step-by-step explanation:
Answer:
D. -3z+2
Step-by-step explanation:
Steps:
Remove parentheses: (a) = a
= 5z+9-(8z+7)
....
Simplify
5z+9-8z-7: -3z+2
Kinetic energy formula is
K.E =

mv²
m = 0.5 kg
v = 3 m/s
Plug in the given.
K.E =

× (0.5) × (3)²
=
2.25 J