Up to a point, the elongation of a spring is directly proportional to the force applied to it. once you extend the spring more than 10.0 centimeters, however, it no longer follows that simple linear rule. what force will result in stretching the spring 10.0 centimeters?
a.1.2 newton
b.2.2 newton
c2.5 newton
d.3.5 newton

Aproton is projected into a uniform electric field that points vertically upward and has magnitude e. the initial velocity of the proton has a magnitude v0 and is directed at an angle a below the horizontal. (a) find the maximum distance hmax that the proton descends vertically below its initial elevation. you can ignore gravitational forces. (b) after what horizontal distance d does the proton return to its original elevation? (c) sketch the trajectory of the proton. (d) find the numerical values of hmax and dife = 500 n> c, v0 = 4.00 * 105 m> s, anda = 30.0°.