<u>Answer</u>
<em>The total displacement of the object is 320 m</em>
<u>Solution-</u>
From the formulas of mechanics,

Where,
s = displacement
u = initial velocity = 0 ( ∵ As the body was in rest in the beginning )
t = time taken = 8 s
a = acceleration = -10 m/s² ( ∵ -ve is because of the downward motion)
Putting all the values,
( ∵ -ve displacement means it is in downwards)
Answer:
1.Amy should ask every 10th person leaving the school at the end of the day and Amy should ask the 50 students in her computer lab.
2.Yes,the sample is unbiased and equal to everyone.
3.200
Step-by-step explanation: