Part 1: match the letters on the graph to the statements in #1-3 that best describe clara's motion. then answer questions
4 and 5.
1. clara has a positive acceleration for 5 minutes.
2. clara has zero acceleration.
graph of clara's motion
1400
1200
1000
- b
800
3. clara is speeding up for 10 minutes.
velocity (m/min)
4. calculate clara's acceleration for part a of her run.
5
20
25
10 15
time (min)

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.