First slide

Work done by Diff type of forces

Question

The pointer reading versus load graph for a spring balance is as shown in the figure.
The spring constant is

Easy

A

15 kgf/cm
B

5 kgf/cm
C

1 kgf/cm
D

10 kgf/cm

Solution

F = kx or k = slope of F-x graph [when F (load) is along
Y-axis and extension (x) is along X-axis.)
Here, F is along X-axis.
So, $k = \frac{10}{10} = 1 kgf / cm$

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