The mass in the figure below slides on a frictionless surface. When the mass is pulled out, spring 1 is stretched a distance x1 from its equilibrium position and spring 2 is stretched a distance x2. The spring constants are k1 and k2 respectively. The force pulling back on the mass is:
A)(-k2x1.)
B)(-k2x2.)
C)(-(k1x1 + k2x2).)
D) $-\frac{k_{1}+k_{2}}{2}\left(x_{1}+x_{2}\right)$ .
E) $-\frac{k_{1}+k_{2}}{k_{1} k_{2}}\left(x_{1}+x_{2}\right)$ .

Question

The mass in the figure below slides on a frictionless surface. When the mass is pulled out, spring 1 is stretched a distance x1 from its equilibrium position and spring 2 is stretched a distance x2. The spring constants are k1 and k2 respectively. The force pulling back on the mass is: 
A)(-k2x1.) 
B)(-k2x2.) 
C)(-(k1x1 + k2x2).) 
D) $-\frac{k_{1}+k_{2}}{2}\left(x_{1}+x_{2}\right)$ . 
E) $-\frac{k_{1}+k_{2}}{k_{1} k_{2}}\left(x_{1}+x_{2}\right)$ .

Quizplus · Accepted Answer

The Answer of The mass in the figure below slides on a frictionless surface. When the mass is pulled out, spring 1 is stretched a distance x1 from its equilibrium position and spring 2 is stretched a distance x2. The spring constants are k1 and k2 respectively. The force pulling back on the mass is: 
A)(-k2x1.) 
B)(-k2x2.) 
C)(-(k1x1 + k2x2).) 
D) $-\frac{k_{1}+k_{2}}{2}\left(x_{1}+x_{2}\right)$ . 
E) $-\frac{k_{1}+k_{2}}{k_{1} k_{2}}\left(x_{1}+x_{2}\right)$ .

The Mass in the Figure Below Slides on a Frictionless −k1+k22(x1+x2)-\frac{k_{1}+k_{2}}{2}\left(x_{1}+x_{2}\right)−2k1​+k2​​(x1​+x2​)

The Mass in the Figure Below Slides on a Frictionless $-\frac{k_{1}+k_{2}}{2}\left(x_{1}+x_{2}\right)$