Answer:
Thermometer will read 26 degrees Celsius.
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The mass m of the object = 5.25 kg
<h3>Further explanation</h3>
Given
k = spring constant = 3.5 N/cm
Δx= 30 cm - 15 cm = 15 cm
Required
the mass m
Solution
F=m.g
Hooke's Law
F = k.Δx

The weight of the car in the picture of the computer screen is 9,800 Newton's.
Answer:
send the wagon down a higher hill