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2. The net force on the student is zero, so the force the scale exerts on the student has no direction.

/in /by

In which direction does the force due to the

scale act on the student?

1. left

2. The net force on the student is zero, so the force the scale exerts on the student has no direction.

3. backward

4. forward

5. down

6. up

7. right

(2 of 8)

What is the mass of the student?

1.m≈10kg

2. m ≈ 60 kg

3.m≈30kg

4. m ≈ 40 kg

5. m ≈ 90 kg

6. m ≈ 50 kg

7. m ≈ 20 kg 

8. m ≈ 80 kg

9. m ≈ 70 kg 

(3 of 8)

Calculate the acceleration of the elevator dur- ing the fourth 5 s interval (from 15 s to 20 s).

Answer in units of m/s2. 

(4 of 8)

Choose the correct plot for acceleration vs time. 

 
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