Which is a characteristic of the atom marked a

Aspring with a mass of 2 kg has a damping constant 14 kg/s. a force of 3.6 n is required to keep the spring stretched 0.3 m beyond its natural length. the spring is stretched 0.6 m beyond its natural length and then released. find the position of the mass at any time t. (assume that movement to the right is the positive x-direction and the spring is attached to a wall at the left end.)

What are atoms of the same element with varying number of neutrons

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above