ANSWER:
Radioactive element life years = 1000/2 = 500yrs.
So, Rock years
- 6.25/100 × 500
- 31.25years.
Answer:
H and J
Explanation:
F With great diversity comes and increase in species
G with an increase of animals there is an increase in competition not a decrease
H and J both seem right since the more animals the more competitive it is for space and food
Answer:
The deceleration of the plane is 0.25 m/
.
Explanation:
Deceleration is the converse of acceleration.
From first law of motion, we have;
v = u + at
where: v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken.
Thus,
v = 50 m/s
u = 80 m/s
t = 120 s
50 = 80 + 120a
50 - 80 = 120a
-30 = 120a
a = 
= -0.25
a = -0.25 m/
The deceleration of the plane is 0.25 m/
.